[1] Kurashiki Cent Hosp, Kurashiki, Okayama, Japan
[2] Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Okayama, Japan
[3] Kawasaki Med Sch, Kurashiki, Okayama, Japan
[4] Tottori Univ, Fac Med, Yonago, Tottori 683, Japan
[5] Japanese Red Cross Nagasaki Genbaku Hosp, Nagasaki, Japan
[6] Okayama Saiseikai Gen Hosp, Okayama, Japan
[7] Uwajima City Hosp, Uwajima, Japan
[8] Ehime Univ Hosp, Touon, Japan
[9] Kagawa Prefectural Cent Hosp, Takamatsu, Kagawa, Japan
[10] Iwakuni Clin Ctr, Iwakuni, Japan
[11] Kyushu Univ, Fac Med Sci, Fukuoka 812, Japan
[12] Kyoto Univ, Grad Sch Med, Kyoto, Japan