title: Practice guidelines cannot be justified in the absence of sufficient evidence: inaction is far more appropriate than indefensible action.
authors.affiliation: Department of Obstetrics and Gynecology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
authors.forename: Marc A
authors.initials: MA
authors.lastname: Fritz
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Ory
mesh_terms: D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D010062:Ovulation Induction / Q000009:adverse effects / Q000379:methods; D017410:Practice Guidelines as Topic; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012098:Reproduction; D027724:Reproductive Techniques, Assisted; D012955:Societies, Medical