title: Multicentre trials in obstetrics and gynaecology. Smaller explanatory trials are required.
authors.forename: J M
authors.initials: JM
authors.lastname: Morris
mesh_terms: D001241:Aspirin / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D015337:Multicenter Studies as Topic; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular / Q000188:drug therapy*; D016032:Randomized Controlled Trials as Topic
chemical_list: D001241:Aspirin