- Correspondence to Professor Xuegang Guo or Yanglin Pan, Xijing Hospital of Digestive Diseases, Fourth Military Medical University, 169 Changle West Road, Xi'an, Shannxi 710032, China; or firstname.lastname@example.org
- Received December 9, 2012
- Revised February 19, 2013
- Accepted February 21, 2013
- First published March 16, 2013.
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