1. Osaka Institute of Public Health3‐69, Nakamichi1‐chome, Higashinari‐ku, Osaka537‐0025Japan
2. Sakai City Institute of Public health3‐2‐8, Kainocho‐higashiSakai‐ku, Sakai, Osaka590‐0953Japan
3. Chiba Prefectural Institute of Public Health666‐2 Nitona‐choChuo‐ku, Chiba260‐8715Japan
4. Kimitsu Health Center3‐4‐34, ShindenKisarazu, Chiba292‐0832Japan
5. Hidaka General Hospital116‐2, SonoGobo‐City, Wakayama644‐8655Japan
6. National Hospital OrganizationNagoya Medical Center4‐1‐1 SannomaruNaka‐ku, Nagoya460‐0001Japan