1. Department of Obstetrics and Gynecology, University of California, Irvine, Orange, California
2. Department of Obstetrics and Gynecology, Southern California Permanente Medical Group, Pasadena, California
3. Department of Gastroenterology, Southern California Permanente Medical Group, Pasadena, California
4. Department of Pathology, Southern California Permanente Medical Group, Pasadena, California