- Correspondence to 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 June 23, 2011
- Accepted October 9, 2011
- First published November 25, 2011.
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