![]() ![]() Observational studies involve recording changes over time among a specific group of people in their natural settings.Clinical trials determine if a new test or treatment for a disease is effective and safe by comparing groups receiving different tests/treatments.There are two main types of clinical studies: ![]() ![]() Abnormal bleeding Abnormal eyelash morphology Abnormal heart valve morphology Abnormal oral frenulum morphology Abnormality of the face Abnormality of the skin Aortic dissection Aplasia/Hypoplasia of the earlobes Aplasia/Hypoplasia of the eyebrow Bladder diverticulum Bruising susceptibility Carious teeth Cognitive impairment Cryptorchidism Dermal translucency Epicanthus Gastrointestinal infarctions Global developmental delay Hypertelorism Hypertension Internal hemorrhage Macule Melanocytic nevus Mitral valve prolapse Pectus excavatum Peripheral arteriovenous fistula Pneumothorax Prematurely aged appearance Protruding ear Short stature Sprengel anomaly Telecanthus Thin skin Vascular dilatation Arterial dissection Arteriovenous fistula Arteriovenous fistulas of celiac and mesenteric vessels Flat face Glaucoma Premature birth Proptosis Respiratory insufficiency Talipes equinovarus Telangiectasia of the skin Thin vermilion border Varicose veins Abnormal intestine morphology Abnormal pupil morphology Abnormality of cardiovascular system morphology Abnormality of hair texture Abnormality of skin pigmentation Abnormality of the dentition Abnormality of the gingiva Alopecia Aortic aneurysm Aplasia/Hypoplasia of the abdominal wall musculature Arterial stenosis Ascending tubular aorta aneurysm Blue sclerae Cigarette-paper scars Congenital hip dislocation Cystocele Deeply set eye Excessive wrinkled skin Gingival overgrowth Gingivitis Hemoptysis High, narrow palate Hypoplastic lacrimal duct Hypospadias Inguinal hernia Joint dislocation Joint hyperflexibility Keratoconus Microdontia Migraine Narrow mouth Narrow nasal bridge Osteoarthritis Osteolysis Periodontitis Premature loss of primary teeth Ptosis Pulmonary artery aneurysm Reduced consciousness/confusion Redundant skin Renovascular hypertension Sleep apnea Subcutaneous nodule Transient ischemic attack Umbilical hernia Uterine prolapse Uterine rupture VertigoĬlinical studies are medical research involving people as participants. ![]()
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