title: Multiple births persist as doctors buck guidelines.
authors.forename: Sylvia Pagan
authors.initials: SP
authors.lastname: Westphal
mesh_terms: D004624:Embryo Transfer; D005060:Europe; D005260:Female; D005307:Fertilization in Vitro; D019983:Guideline Adherence; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications / Q000517:prevention & control; D011272:Pregnancy, Multiple / Q000706:statistics & numerical data*; D012306:Risk; D014481:United States