- Correspondence to Dr Rong-Qiang Zhang, Shaanxi University of Chinese Medicine, Xianyang, Shiji Road, Shaanxi 712046, China;
- Received 4 April 2017
- Revised 24 May 2017
- Accepted 4 June 2017
- Published in print 10 July 2017.
- Published first 8 July 2017.
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