title: Cross-over design trials in infertility--how much multiplicity is too much?
authors.forename: Baris
authors.initials: B
authors.lastname: Ata
authors.forename: William
authors.initials: W
authors.lastname: Buckett
mesh_terms: D002986:Clinical Trials as Topic; D003075:Coitus; D018592:Cross-Over Studies; D005260:Female; D005298:Fertility; D006801:Humans; D007248:Infertility, Male / Q000503:physiopathology / Q000628:therapy*; D007315:Insemination, Artificial; D008297:Male; D010062:Ovulation Induction; D011446:Prospective Studies; D012107:Research Design; D013997:Time Factors; D016896:Treatment Outcome