- Correspondence to Professor L Yu, Department of Pathology, Affiliated Calmaette Hospital of Kunming Medical University, 504 Qing Nian Road, Kunming, Yunnan 650011, PR China;
- Received 14 December 2016
- Revised 16 February 2017
- Accepted 23 February 2017
- Published online 17 March 2017.
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