1. University of Texas Health Science Center at Houston, Department of Obstetrics, Gynecology and Reproductive Sciences, Lyndon Baines Johnson Hospital, Houston, TX, USA
2. Department of OB–GYN–Pensacola, University of Florida College of Medicine, 5045 Carpenter Creek, Pensacola, FL 32513, USA
3. University of Texas Health Science Center at Houston, School of Public Health, Houston, TX, USA