- Correspondence to Professor Takayuki Sumida, Department of Internal Medicine, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba-city, Ibaraki 305-8575, Japan;
- Received November 2, 2016
- Revised January 30, 2017
- Accepted February 21, 2017
- First published March 22, 2017.
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