1. Department of Obstetrics, Gynecology, and Reproductive Sciences (L.A., J.A.H., J.L.W., M.C., L.C.G.), University of California, San, Francisco, San Francisco, California 94143
2. Department of Experimental Biology (F.J.E.), University of Jaén, Jaén, 23002 Spain
3. Center for Special Minimally Invasive Surgery (C.N.N.), Stanford University, Stanford, California 94024