- Correspondence to Xie-Tong Wang, Department of Obstetrics and Gynecology, Provincial Hospital Affiliated to Shandong University, Jingwu weiqi road No.324, Jinan, Shandong 250021, China;
- Received August 19, 2009
- Accepted May 7, 2011
- First published June 9, 2011.
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