- Address correspondence and reprint requests to Hongxia Li, MD, PhD, Department of Obstetrics and Gynecology, Beijing Shijitan Hospital of Capital Medical University, 10 Tieyi Road of Haidian District, Beijing 100038, China. E-mail: Lihx69@hotmail.com.
- Received June 8, 2012
- First published November 1, 2012.
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