title: Clinical trials in dermatology, part 2: numbers of patients required.
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy; D004341:Drug Evaluation / Q000379:methods*; D005163:Factor Analysis, Statistical; D006801:Humans; D012494:Sampling Studies; D012871:Skin Diseases / Q000188:drug therapy*; D013752:Tetracycline / Q000627:therapeutic use
chemical_list: D013752:Tetracycline