Risks of nonchromosomal birth defects, small-for-gestational age birthweight, and prematurity with in vitro fertilization: effect of number of embryos transferred and plurality at conception versus at birth

Barbara Luke, Morton B. Brown, Ethan Wantman, Nina Forestieri, Marilyn L. Browne, Sarah C. Fisher, Mahsa M. Yazdy, Mary K. Ethen, Mark A. Canfield, Hazel B. Nichols, Sergio Oehninger, Kevin J. Doody, Alastair Sutcliffe, Carrie Williams, Michael L. Eisenberg, Valerie L. Baker, Caitlin R. Sacha, Philip J. Lupo