Barnhart Kurt T
Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.
Fertil Steril. 2014 Oct;102(4):950-1. doi: 10.1016/j.fertnstert.2014.08.026. Epub 2014 Sep 8.