Gin-Den Chen1, Diaa E E Rizk2, Holly E Richter3. 1. Department of Obstetrics and Gynecology, Chung Shan Medical University Hospital, 110, Jianguo N Rd, Section 1, Taichung, 402, Taiwan. gdchentw@hotmail.com. 2. Department of Obstetrics and Gynecology, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain. 3. Department of Obstetrics and Gynecology, University of Alabama at Birmingham, Birmingham, AL, USA.