title: Effect of 13-cis retinoic acid on cystic acne in Singapore.
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy*; D000293:Adolescent; D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015474:Isotretinoin; D008297:Male; D012846:Singapore; D014212:Tretinoin / Q000627:therapeutic use*
chemical_list: D014212:Tretinoin; D015474:Isotretinoin