- Correspondence to Dr Yuya Tamai, Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, 1-1, Yanagido, Gifu 501-1194, Japan;
- Received March 14, 2012
- Revised December 26, 2012
- Accepted December 27, 2012
- First published January 26, 2013.
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