- Correspondence to Dr Hiroyuki Hikichi, Department of Social and Behavioral Sciences, Harvard T. H. Chan School of Public Health,401 Park Drive, Landmark Center Room 403-T, Boston, MA 02215, USA;
- Received December 5, 2014
- Revised March 5, 2015
- Accepted March 26, 2015
- First published April 17, 2015.
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