- Correspondence to Dr Tadashi Kobayashi, Department of General Medicine, Hirosaki University School of Medicine & Hospital, Hirosaki-shi, Aomori-ken, 036-8563, Japan;
- Accepted 31 July 2017
- Published in print 1 July 2017.
- Published online 21 September 2017.
- Published first 24 August 2017.
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