- 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 email@example.com
- Received 9 December 2012
- Revised 19 February 2013
- Accepted 21 February 2013
- Published in print 1 March 2013.
- Published online 16 March 2013.
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