Pregnancy registry: three-year follow-up of children conceived from letrozole, clomiphene, or gonadotropins

Richard S. Legro, Michael P. Diamond, Christos Coutifaris, William D. Schlaff, Ruben Alvero, Peter R. Casson, Gregory M. Christman, Robert M. Rosen, Marcelle I. Cedars, Karl R. Hansen, Randal D. Robinson, Valerie L. Baker, Rebecca Usadi, William C. Dodson, Stephanie J. Estes, Allen R. Kunselman, Christina Stetter, Kurt T. Barnhart, R. Matthew Coward, J.C. Trussell, Stephen A. Krawetz, Nanette Santoro, Hao Huang, Heping Zhang, Esther Eisenberg