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REM Sleep Behavior Disorder (Neurology / Sleep Disorders) RFT1-CDG (Rare Diseases / Digestive Diseases) RFT1-CDG (Rare Diseases / Ear, Nose, & Throat Diseases) RFT1-CDG (CDG-IN) (Rare Diseases / Nervous System Diseases) RFT1-CDG (CDG-IN) (Rare Diseases / Metabolic Disorders) Rabson-Mendenhall Syndrome (Rare Diseases / Skin Diseases) Rabson-Mendenhall Syndrome (Rare Diseases / Endocrine Diseases) Rapid Testing for HIV (Infectious Disease / HIV) Rapid Testing for HIV (Emergency Medicine / Infectious Diseases) Retinopathy of Prematurity (Rare Diseases / Eye Diseases) Rokitansky-Aschoff Sinuses (Rare Diseases / Miscellaneous) Rosai-Dorfman Disease (Rare Diseases / Skin Diseases) Rosai-Dorfman Disease (Rare Diseases / Blood Diseases) Rothmund-Thomson Syndrome (Rare Diseases / Miscellaneous) Rubinstein-Taybi Syndrome (Rare Diseases / Pediatric Diseases) Russell-Silver Syndrome (Rare Diseases / Miscellaneous) Rabies (Rare Diseases / Viral Infections) Rabies (Emergency Medicine / Infectious Diseases) Rabies (Neurology / Neurologic Infections) Rabies (Infectious Disease / Viral Infections) Radial Clubhand (Orthopedic Surgery / Hand & Upper Extremity) Radial Gutter Splinting (Orthopedic Surgery / Trauma) Radial Head Dislocation (Orthopedic Surgery / Elbow) Radial Head Dislocation (Emergency Medicine / Orthopedic Trauma) Radial Head Fractures (Orthopedic Surgery / Hand & Upper Extremity) Radial Head Subluxation (Orthopedic Surgery / Elbow) Radial Head Subluxation (Emergency Medicine / Orthopedic Trauma) Radial Hypoplasia (Rare Diseases / Miscellaneous) Radial Mononeuropathy (Orthopedic Surgery / Trauma) Radial Nerve Entrapment (Orthopedic Surgery / Hand & Upper Extremity) Radiation Cystitis (Urology / Infections & Inflammatory Conditions) Radiation Emergencies (Emergency Medicine / Bioterrorism & Disaster Medicine) Radiation Enteritis (General Surgery / Abdomen) Radiation Exposure (Procedures / Critical Care) Radiation Induced Brachial Plexopathy (Rare Diseases / Nervous System Diseases) Radiation Induced Cancer (Rare Diseases / Rare Cancers) Radiation Induced Meningioma (Rare Diseases / Rare Cancers) Radiation Necrosis (Neurology / Neuro-oncology) Radiation Necrosis (Oncology / Neuro-oncology) Radiation Nephropathy (Nephrology / Drug & Nephrotoxin Related) Radiation Sickness (Rare Diseases / Environmental Diseases) Radiation Therapy (Oncology / Head & Neck Cancers) Radiation Therapy for Neck Metastases (Oncology / Head & Neck Cancers) Radiation- & Chemotherapy-induced Nausea & Vomiting Guidelines (Oncology / Cancer Guidelines & Staging) Radiation-induced Brachial Plexopathy (Physiatry / Plexopathy) Radiation-induced Lumbosacral Plexopathy (Physiatry / Plexopathy) Radical Cystectomy (Urology / Urologic Cancer) Radical Hysterectomy (Procedures / Obstetric & Gynecologic) Radical Neck Dissection (Oncology / Head & Neck Cancers) Radical Nephrectomy (Urology / Surgery) Radical Prostatectomy (Oncology / Genitourinary Cancers) Radical Prostatectomy (Procedures / Genitourinary) Raine Syndrome (Rare Diseases / Musculoskeletal Diseases) Ramon Syndrome (Rare Diseases / Mouth Diseases) Ramon Syndrome (Rare Diseases / Musculoskeletal Diseases) Ramsay Hunt Syndrome (Rare Diseases / Nervous System Diseases) Rapadilino Syndrome (Rare Diseases / Ear, Nose, & Throat Diseases) Rapadilino Syndrome (Rare Diseases / Musculoskeletal Diseases) Rapadilino Syndrome (Rare Diseases / Mouth Diseases) Rapid Sequence Intubation (Procedures / Lung & Respiratory) Rapid Sequence Intubation (Critical Care / Gastrointestinal) Rapid Sequence Intubation (Emergency Medicine / Gastrointestinal) Rapid-onset Dystonia-parkinsonism (Rare Diseases / Nervous System Diseases) Rapp-hodgkin Syndrome (Rare Diseases / Miscellaneous) Rasmussen Encephalitis (Rare Diseases / Nervous System Diseases) Rattlesnake Envenomation (Emergency Medicine / Environmental) Raynaud Phenomenon (Internal Medicine / Rheumatic Disorders) Raynaud Phenomenon (NP/PA Practice / Rheumatic Disorders) Raynaud Phenomenon (Rheumatology / Systemic Rheumatic Disease) Raynaud Phenomenon (Family Medicine / Rheumatic Disorders) Raynaud Phenomenon (Orthopedic Surgery / Systemic Diseases) Reactive Arthritis (Rheumatology / Spondylarthropathies) Reactive Arthritis (Rare Diseases / Musculoskeletal Diseases) Reardon Wilson Cavanagh Syndrome (Rare Diseases / Nervous System Diseases) Reardon Wilson Cavanagh Syndrome (Rare Diseases / Ear, Nose, & Throat Diseases) Recessive Dystrophic Epidermolysis Bullosa-generalized Other (Rare Diseases / Skin Diseases) Recessive Dystrophic Epidermolysis Bullosa-generalized Other (Rare Diseases / Eye Diseases) Rectal Cancer (Oncology / Gastrointestinal Cancers) Rectal Foreign Bodies (Emergency Medicine / Gastrointestinal) Rectal Prolapse (General Surgery / Colorectal) Rectal Prolapse (Procedures / Gastronintestinal) Rectocele (Obstetrics & Gynecology / Female Pelvic Medicine & Surgery) Rectocele (Emergency Medicine / Obstetric & Gynecologic) Rectocele Repair (Procedures / Obstetric & Gynecologic) Rectovaginal Fistula (General Surgery / Colorectal) Rectus Sheath Hematoma (Emergency Medicine / Gastrointestinal) Recurrent Bladder Cancer (Oncology / Genitourinary Cancers) Recurrent Corneal Erosion (Ophthalmology / Cornea) Recurrent Respiratory Papillomatosis (Pulmonology / Lung Tumors) Recurrent Respiratory Papillomatosis (Rare Diseases / Ear, Nose, & Throat Diseases) Recurrent Respiratory Papillomatosis (Rare Diseases / Lung Diseases) Red Blood Cell Disorders (Hematology / Red Blood Cell Disorders) Red Cell Distribution Width (Laboratory Medicine / Hematology) Red Eye (Ophthalmology / Conjunctiva) Redback Spider Envenomation (Emergency Medicine / Environmental) Reducing Body Myopathy (Rare Diseases / Nervous System Diseases) Reduction of Mandibular Dislocation (Orthopedic Surgery / Trauma) Reduction of Patellar Dislocation (Orthopedic Surgery / Knee) Reduction of Shoulder Dislocation (Orthopedic Surgery / Shoulder) Reflex Epilepsy (Neurology / Epilepsy & Seizures) Reflux Esophagitis (Pathology / Gastrointestinal) Refractive Disorders (Ophthalmology / Refractive Disorders) Refractory Celiac Disease (Rare Diseases / Autoimmune / Autoinflammatory Diseases) Refractory Cytopenia (Rare Diseases / Blood Diseases) Refsum Disease (Rare Diseases / Eye Diseases) Refsum Disease (Rare Diseases / Skin Diseases) Refsum Disease (Rare Diseases / Metabolic Disorders) Refsum Disease (Rare Diseases / Nervous System Diseases) Regional Anesthesia (Procedures / Anesthetic Techniques) Regional Blocks (Pain Management / Critical Events) Regional Pain Syndrome (Emergency Medicine / Neurologic) Regional Pain Syndromes (Neurology / Headache & Pain) Rehabiliation (Physiatry / Rehabilitation) Rehabilitation Guidelines (Physiatry / Clinical Guidelines) Rehabilitation Protocols (Physiatry / Rehabilitation Protocols) Relapsing Fever (Infectious Disease / Bacterial Infections) Relapsing Fever (Emergency Medicine / Infectious Diseases) Relapsing Polychondritis (Rare Diseases / Kidney & Urinary Diseases) Relapsing Polychondritis (Rare Diseases / Immune System Diseases) Renal Agenesis (Rare Diseases / Kidney & Urinary Diseases) Renal Arteriovenous Malformation (Nephrology / Systemic Diseases & the Kidney) Renal Artery Aneurysm (Vascular Surgery / Vascular Surgery) Renal Artery Aneurysm (Nephrology / Systemic Diseases & the Kidney) Renal Artery Stenosis (Cardiology / Atherosclerosis) Renal Artery Stenosis (Nephrology / Hypertension & the Kidney) Renal Biopsy (Procedures / Genitourinary) Renal Cell Carcinoma (Rare Diseases / Rare Cancers) Renal Cell Carcinoma (Nephrology / Systemic Diseases & the Kidney) Renal Cell Carcinoma (Oncology / Renal Cell Carcinoma) Renal Cell Carcinoma (Oncology / Genitourinary Cancers) Renal Cell Carcinoma Guidelines (Oncology / Cancer Guidelines & Staging) Renal Cell Carcinoma Pathology (Pathology / Genitourinary) Renal Cell Carcinoma Staging (Oncology / Cancer Guidelines & Staging) Renal Coloboma Syndrome (Rare Diseases / Kidney & Urinary Diseases) Renal Coloboma Syndrome (Rare Diseases / Eye Diseases) Renal Failure (Internal Medicine / Genitourinary Disorders) Renal Failure (Family Medicine / Genitourinary Disorders) Renal Failure (NP/PA Practice / Genitourinary Disorders) Renal Glycosuria (Rare Diseases / Metabolic Disorders) Renal Glycosuria (Rare Diseases / Kidney & Urinary Diseases) Renal Hypomagnesemia 2 (Rare Diseases / Metabolic Disorders) Renal Hypomagnesemia 2 (Rare Diseases / Kidney & Urinary Diseases) Renal Hypomagnesemia-6 (Rare Diseases / Kidney & Urinary Diseases) Renal Hypomagnesemia-6 (Rare Diseases / Metabolic Disorders) Renal Hypouricemia (Rare Diseases / Kidney & Urinary Diseases) Renal Medullary Carcinoma (Rare Diseases / Kidney & Urinary Diseases) Renal Nutcracker Syndrome (Rare Diseases / Digestive Diseases) Renal Nutcracker Syndrome (Rare Diseases / Kidney & Urinary Diseases) Renal Transitional Cell Carcinoma (Nephrology / Systemic Diseases & the Kidney) Renal Transplant (Nephrology / Acute Kidney Injury) Renal Transplantation (Procedures / Transplantation) Renal Trauma (Urology / Trauma) Renal Tubular Acidosis with Deafness (Rare Diseases / Kidney & Urinary Diseases) Renal Tubular Acidosis with Deafness (Rare Diseases / Ear, Nose, & Throat Diseases) Renal Tubular Dysgenesis (Rare Diseases / Kidney & Urinary Diseases) Renal Tubulopathy (Rare Diseases / Metabolic Disorders) Renal Vein Thrombosis (Hematology / Coagulation & Hemostasis Disorders) Renal Vein Thrombosis (Vascular Surgery / Vascular Surgery) Renoalimentary Fistula (Urology / Fistulas) Renovascular Hypertension (Cardiology / Atherosclerosis) Renovascular Hypertension (Nephrology / Hypertension & the Kidney) Reoviruses (Infectious Disease / Viral Infections) Repetitive Head Injury Syndrome (Sports Medicine / Neurologic) Replantation (Emergency Medicine / Orthopedic Trauma) Reproductive Endocrinology (Obstetrics & Gynecology / Reproductive Endocrinology & Infertility) Respiratory Failure (Critical Care / Airway & Ventilator Management) Respiratory Syncytial Virus Infection (Infectious Disease / Viral Infections) Respiratory Syncytial Virus Infection (Internal Medicine / Infectious Diseases) Respiratory Syncytial Virus Infection (Pediatrics / Infectious Diseases) Respiratory Syncytial Virus Infection (Family Medicine / Infectious Diseases) Respiratory Syncytial Virus Infection (NP/PA Practice / Infectious Diseases) Restless Legs Syndrome (Neurology / Sleep Disorders) Restless Legs Syndrome (Rare Diseases / Nervous System Diseases) Restless Legs Syndrome (Psychiatry / Major Psychiatric Disorders) Restorative Dentistry (Dental & Oral Health / Restorative Dentistry) Restrictive Cardiomyopathy (Cardiology / Myocardial Disease & Cardiomyopathies) Restrictive Lung Disease (Pulmonology / Interstitial Lung Diseases) Reticular Dysgenesis (Rare Diseases / Immune System Diseases) Reticulocyte Count (Laboratory Medicine / Hematology) Retina (Ophthalmology / Retina) Retinal Arterial Macroaneurysm (Rare Diseases / Nervous System Diseases) Retinal Arterial Macroaneurysm (Rare Diseases / Eye Diseases) Retinal Artery Occlusion (Emergency Medicine / Ophthalmologic) Retinal Artery Occlusion (Ophthalmology / Retina) Retinal Detachment (Ophthalmology / Retina) Retinal Detachment (Emergency Medicine / Ophthalmologic) Retinal Vasculopathy (Rare Diseases / Eye Diseases) Retinal Vasculopathy (Rare Diseases / Nervous System Diseases) Retinal Vasculopathy with Cerebral Leukodystrophy (Rare Diseases / Kidney & Urinary Diseases) Retinal Vasculopathy with Cerebral Leukodystrophy (Rare Diseases / Musculoskeletal Diseases) Retinal Vein Occlusion (Emergency Medicine / Ophthalmologic) Retinal Vein Occlusion (Ophthalmology / Retina) Retinitis Pigmentosa (Rare Diseases / Ear, Nose, & Throat Diseases) Retinitis Pigmentosa (Rare Diseases / Eye Diseases) Retinitis Pigmentosa (Ophthalmology / Retina) Retinoblastoma (Rare Diseases / Rare Cancers) Retinoblastoma (Oncology / Ophthalmologic Cancers) Retinoblastoma (Ophthalmology / Retina) Retinoschisis (Rare Diseases / Eye Diseases) Retinoschisis (Ophthalmology / Retina) Retrocalcaneal Bursitis (Sports Medicine / Foot & Ankle) Retroperitoneal Fibrosis (Rare Diseases / Digestive Diseases) Retroperitoneal Fibrosis (Urology / Hydronephrosis & Ureter) Retroperitoneal Fibrosis (Nephrology / Systemic Diseases & the Kidney) Retroperitoneal Fibrosis (Rare Diseases / Kidney & Urinary Diseases) Retroperitoneal Liposarcoma (Rare Diseases / Rare Cancers) Retroperitoneal Lymph Node Dissection (Urology / Surgery) Retropharyngeal Abscess (Emergency Medicine / Ear, Nose, & Throat ) Rett Syndrome (Rare Diseases / Nervous System Diseases) Reverse Transcriptase-polymerase Chain Reaction (Laboratory Medicine / Infectious Disease) Reversible Cerebral Vasoconstriction Syndrome (Rare Diseases / Nervous System Diseases) Revesz Syndrome (Rare Diseases / Eye Diseases) Revesz Syndrome (Rare Diseases / Blood Diseases) Reye Syndrome (Rare Diseases / Pediatric Diseases) Reye Syndrome (Emergency Medicine / Pediatric) Reynolds Syndrome (Rare Diseases / Kidney & Urinary Diseases) Reynolds Syndrome (Rare Diseases / Skin Diseases) Reynolds Syndrome (Rare Diseases / Blood Diseases) Reynolds Syndrome (Rare Diseases / Digestive Diseases) Rh Incompatibility (Obstetrics & Gynecology / Obstetric Complications) Rh Incompatibility (Emergency Medicine / Obstetric & Gynecologic) Rh Typing (Pathology / Transfusion Medicine) Rhabdoid Tumor (Rare Diseases / Nervous System Diseases) Rhabdoid Tumor (Rare Diseases / Rare Cancers) Rhabdomyolysis (Pediatrics / Rheumatology) Rhabdomyomatous Mesenchymal Hamartoma (Rare Diseases / Skin Diseases) Rhabdomyosarcoma Alveolar (Rare Diseases / Rare Cancers) Rhegmatogenous Retinal Detachment (Ophthalmology / Retina) Rheumatic Fever (Cardiology / Valvular Heart Disease) Rheumatic Fever (Infectious Disease / Cardiovascular & Intravascular Infections) Rheumatic Fever (Emergency Medicine / Rheumatologic) Rheumatic Fever (Pediatrics / Rheumatology) Rheumatic Fever (Rare Diseases / Bacterial Infections) Rheumatoid Arthritis (Rheumatology / Rheumatoid Arthritis) Rheumatoid Arthritis (Family Medicine / Rheumatic Disorders) Rheumatoid Arthritis (Internal Medicine / Rheumatic Disorders) Rheumatoid Arthritis (NP/PA Practice / Rheumatic Disorders) Rheumatoid Factor (Laboratory Medicine / Rheumatology) Rhinitis (Family Medicine / Nose Disorders) Rhinitis (Internal Medicine / Nose Disorders) Rhinitis (NP/PA Practice / Nose Disorders) Rhinitis Medicamentosa (Allergy & Immunology / Major Allergic Diseases) Rhinoplasty (Procedures / Reconstructive & Aesthetic) Rhinoplasty (Procedures / Skin & Soft Tissue) Rhinoscleroma (Infectious Disease / Skin & Soft Tissue Infections) Rhinoscleroma (Dermatology / Bacterial Infections) Rhinoscopy (Procedures / Ear, Nose, Throat, & Dental ) Rhinovirus (Infectious Disease / Viral Infections) Rhizomelic Chondrodysplasia Punctata (Rare Diseases / Nervous System Diseases) Rhizomelic Chondrodysplasia Punctata (Rare Diseases / Miscellaneous) Rhizomelic Chondrodysplasia Punctata (Rare Diseases / Musculoskeletal Diseases) Rhizomelic Chondrodysplasia Punctata (Rare Diseases / Eye Diseases) Rhodococcus Equi (Infectious Disease / Bacterial Infections) Rhyns Syndrome (Rare Diseases / Eye Diseases) Rhyns Syndrome (Rare Diseases / Kidney & Urinary Diseases) Rib Fracture (Emergency Medicine / Orthopedic Trauma) Ribbing Disease (Rare Diseases / Connective Tissue Diseases) Riboflavin Deficiency (Endocrinology & Diabetes / Metabolic Disorders) Riboflavin Transporter Deficiency (Rare Diseases / Ear, Nose, & Throat Diseases) Riboflavin Transporter Deficiency (Rare Diseases / Nervous System Diseases) Richards-rundle Syndrome (Rare Diseases / Nervous System Diseases) Richards-rundle Syndrome (Rare Diseases / Ear, Nose, & Throat Diseases) Richter Syndrome (Rare Diseases / Rare Cancers) Ricin Exposure (Neurology / Neurotoxicology) Ricin Exposure (Emergency Medicine / Bioterrorism & Disaster Medicine) Rickets (Rare Diseases / Pediatric Diseases) Rickets (Pediatrics / Nutrition) Rickets (Rare Diseases / Nutritional Diseases) Rickettsial Infection (Pediatrics / Infectious Diseases) Rickettsialpox (Infectious Disease / Bacterial Infections) Rieger Syndrome (Rare Diseases / Musculoskeletal Diseases) Right Colectomy (Procedures / Gastronintestinal) Right Ventricle Hypoplasia (Rare Diseases / Heart Diseases) Right Ventricular Infarction (Vascular Surgery / Coronary Surgery) Right Ventricular Infarction (Cardiology / Congenital Heart Disease) Rigid Sigmoidoscopy (Procedures / Gastronintestinal) Rigid Sigmoidoscopy (Gastroenterology / Intestinal Conditions) Rigid Spine Syndrome (Rare Diseases / Musculoskeletal Diseases) Rigid Spine Syndrome (Rare Diseases / Nervous System Diseases) Ring Chromosome 1 (Rare Diseases / Chromosome Disorders) Ring Chromosome 10 (Rare Diseases / Chromosome Disorders) Ring Chromosome 11 (Rare Diseases / Chromosome Disorders) Ring Chromosome 13 (Rare Diseases / Chromosome Disorders) Ring Chromosome 14 (Rare Diseases / Nervous System Diseases) Ring Chromosome 14 (Rare Diseases / Chromosome Disorders) Ring Chromosome 15 (Rare Diseases / Chromosome Disorders) Ring Chromosome 17 (Rare Diseases / Chromosome Disorders) Ring Chromosome 18 (Rare Diseases / Chromosome Disorders) Ring Chromosome 19 (Rare Diseases / Chromosome Disorders) Ring Chromosome 2 (Rare Diseases / Chromosome Disorders) Ring Chromosome 20 (Rare Diseases / Nervous System Diseases) Ring Chromosome 20 (Rare Diseases / Chromosome Disorders) Ring Chromosome 21 (Rare Diseases / Chromosome Disorders) Ring Chromosome 22 (Rare Diseases / Chromosome Disorders) Ring Chromosome 3 (Rare Diseases / Chromosome Disorders) Ring Chromosome 4 (Rare Diseases / Chromosome Disorders) Ring Chromosome 5 (Rare Diseases / Chromosome Disorders) Ring Chromosome 6 (Rare Diseases / Chromosome Disorders) Ring Chromosome 7 (Rare Diseases / Chromosome Disorders) Ring Chromosome 8 (Rare Diseases / Chromosome Disorders) Ring Chromosome 9 (Rare Diseases / Chromosome Disorders) Rippling Muscle Disease (Rare Diseases / Nervous System Diseases) Risk Factors for Coronary Artery Disease (Cardiology / Atherosclerosis) Roberts Syndrome (Rare Diseases / Eye Diseases) Roberts Syndrome (Rare Diseases / Ear, Nose, & Throat Diseases) Roberts Syndrome (Rare Diseases / Musculoskeletal Diseases) Roberts Syndrome (Rare Diseases / Mouth Diseases) Robinow Syndrome (Rare Diseases / Miscellaneous) Robotic Surgery (Procedures / Obstetric & Gynecologic) Robotic Surgery (General Surgery / Robotic Surgery) Rocky Mountain Spotted Fever (Infectious Disease / Bacterial Infections) Rocky Mountain Spotted Fever (Rare Diseases / Bacterial Infections) Rodenticide Toxicity (Critical Care / Toxicology) Rodenticide Toxicity (Emergency Medicine / Toxicologic) Roifman Syndrome (Rare Diseases / Miscellaneous) Rolando Fracture (Orthopedic Surgery / Hand & Upper Extremity) Rombo Syndrome (Rare Diseases / Rare Cancers) Rombo Syndrome (Rare Diseases / Skin Diseases) Rosacea (Dermatology / Adnexa Skin Diseases) Roseola Infantum (Infectious Disease / Viral Infections) Roseola Infantum (Emergency Medicine / Pediatric) Roseola Infantum (Dermatology / Viral Infections) Rotator Cuff Disease (Physiatry / Upper Limb Musculoskeletal Conditions) Rotator Cuff Injuries (Emergency Medicine / Orthopedic Trauma) Rotator Cuff Injury (Sports Medicine / Shoulder) Rotator Cuff Pathology (Orthopedic Surgery / Shoulder) Rotavirus (Emergency Medicine / Pediatric) Rotor Syndrome (Rare Diseases / Metabolic Disorders) Rotor Syndrome (Rare Diseases / Digestive Diseases) Rotor Syndrome (Rare Diseases / Blood Diseases) Roussy Levy Syndrome (Rare Diseases / Nervous System Diseases) Routine Health Screening (NP/PA Practice / Health Maintenance) Routine Health Screening (Family Medicine / Health Maintenance) Routine Health Screening (Internal Medicine / Health Maintenance) Rubber-band Ligation (Procedures / Gastronintestinal) Rubella (Emergency Medicine / Pediatric) Rubella (Rare Diseases / Viral Infections) Rud Syndrome (Rare Diseases / Miscellaneous) Rutherfurd Syndrome (Rare Diseases / Eye Diseases) Rutherfurd Syndrome (Rare Diseases / Mouth Diseases) Ruvalcaba Syndrome (Rare Diseases / Nervous System Diseases)