[1] Saitama Med Univ, Iruma, Saitama, Japan
[2] Tottori Univ, Yonago, Tottori, Japan
[3] Hiroshima City Hosp, Hiroshima, Japan
[4] Himeji Red Cross Hosp, Himeji, Hyogo, Japan
[5] Ohfuku Clin, Okayama, Japan
[6] Tokuyama Cent Hosp, Shunan City, Japan
[7] Yamaguchi Red Cross Hosp, Yamaguchi, Japan
[8] Kitasato Inst, Tokyo, Japan