1. The Woman's Hospital of Texas, 7600 Fannin Street, Houston, TX 77054, USA
2. Kelsey Research Foundation, 5615 Kirby Drive, Suite 660, Houston, TX 77005, USA
3. Department of Obstetrics and Gynecology, Kelsey-Seybold Clinic, 7900 Fannin Street Suite 2100, Houston, TX 77054, USA