Corresponding Author

Tomoyuki Kawada MD & PhD

Department of Hygiene and Public Health, Nippon Medical School

Correspondence

Tomoyuki Kawada, M.D. Address: Department of Hygiene and Public Health, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-Ku, Tokyo 113-8602, Japan Tel: 81-3-3822-2131, Fax: 81-3-5685-3065,

Email: kawada@nms.ac.jp