- Correspondence to Dr Naoki Kondo, Floor 3, Medical Building #3, School of Public Health, the University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;
- Received October 16, 2014
- Revised January 22, 2015
- Accepted January 31, 2015
- First published February 19, 2015.
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