Radiation Radiation Therapy Radiation-Induced Heart Disease Radical Prostatectomy Radiofrequency Radiofrequency Ablation Radioiodine Radioiodine-Refractory Cancer Radioligands Radiosurgery Radiotherapy Radium-223 Rai-Refractory Thyroid Cancer Raloxifene Raltegravir Ramucirumab Ranexa Ranibizumab Rankl Inhibitor Ranolazine Rapamycin Raptiva Rasagiline Rasilez Ratacand Ravicti Rcc Cancer Reasanz Rebif Reclast Recombinant Factor Viia Recombinant Human Relaxin-2 Reg1 Anticoagulation System Regorafenib Rejection Relapsing-Remitting Multiple Sclerosis Relvar Ellipta Remeron Remicade Reminyl Remsima Renal Cancer Renal Cell Carcinoma Renal Denervation Renal Disease Renal Failure Renal Impairment Renal Insufficiency Renal Replacement Therapy Renal-Artery Stenosis Renal-Artery Stenting Reperfusion Requip Resistant Hypertension Respiratory Distress Respiratory Infections Respiratory Syncytial Virus Respiratory Viruses Restenosis Restless Legs Syndrome Retigatine Retina Retinal Diseases Retinopathy Retrovirus Revatio Revlimid Revolade Rheumatoid Arthritis Rhinitis Rh-Tsh Ribavirin Ribavirin-Free Regimen Rifaximin Rimonabant Riociguat Risedronate Risk Factors Risk Fracture Risk-Benefit Ratio Risperdal Risperidone Ritonavir Rituximab Rivaroxaban Rivastigmine Rna Interference Rnai Rnai Therapy Rns Stimulator Roactemra Rofecoxib Romosozumab Ropinirole Rosuvastatin Rotarix Rotateq Rotavirus Rotavirus Vaccination Rotavirus Vaccine Roux-En-Y Gastric Bypass Roux-En-Y Gastric Bypass Surgery Roxithromycin Rsv Infection Ru-486 Ruxolitinib Rygb Surgery