- Correspondence to Professor Yoshiya Tanaka, The First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahata-nishi-ku, Kitakyushu, Fukuoka 807-8555, Japan;
- Received 10 April 2013
- Revised 6 July 2013
- Accepted 20 August 2013
- Published online 30 October 2014.
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