- Correspondence to Dr Takahiro Tabuchi, Cancer Control Center, Osaka International Cancer Institute, Chuo-ku, Osaka 541-8567, Japan;
- Received 14 July 2017
- Revised 28 October 2017
- Accepted 2 November 2017
- Published in print 15 December 2017.
- Published online 16 December 2017.
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