- Correspondence to Professor Guang-Yan Yu, Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, 22 Zhong Guan Cun South St., Beijing 100081, PR China;
- Received February 18, 2014
- Revised May 18, 2014
- Accepted June 14, 2014
- First published July 1, 2014.
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