- Address correspondence and reprint requests to Zhi-lan Peng, MD, Department of Obstetrics and Gynecology, West China Second Hospital, Sichuan University, No. 20, Section 3, South People's Rd, Chengdu, Sichuan, 610041, China. E-mail: .
- Received October 29, 2008
- First published April 1, 2009.
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