- Correspondence to Dr Toru Tsuboya, Department of Social and Behavioral Sciences, Harvard School of Public Health, 677 Huntington Avenue Kresge Building 7th Floor Boston, Massachusetts 02115, USA;
- Received June 27, 2014
- Revised November 11, 2014
- Accepted November 18, 2014
- First published December 3, 2014.
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