1. Department of Obstetrics and Gynecology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center,Torrance, California, , Pacific Reproductive Center, Torrance, California
2. Department of Obstetrics and Gynecology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center,Torrance, California
3. Division of Cardiac Surgery, Department of Surgery, First Affiliated Hospital, Sun Yet-sen University, Guangzhou, China