[1] Kurashiki Cent Hosp, Emergency & Crit Care Ctr, 1-1-1 Miwa Kurashiki, Okayama 7100052, Japan
[2] Chiba Univ Hosp, Dept Gen Med, Chiba, Japan
[3] Hlth Sci Univ Hokkaido, Dept Psychosomat Internal Med, Tobetsu, Hokkaido, Japan
[4] Kumamoto Univ, Dept Community Family & Gen Med, Kumamoto, Japan
[5] Taito Hosp, Dept Gen Med, Tokyo, Japan
[6] Mito Kyodo Gen Hosp, Dept Internal Med, Ibaraki, Japan
[7] Okayama Univ Hosp, Dept Gen Med, Okayama, Japan
[8] St Lukes Int Hosp, Dept Infect Dis, Tokyo, Japan
[9] Niigata Seilyo Univ, Dept Clin Psychol, Grad Sch, Niigata, Japan
[10] Shimane Univ, Fac Med, Dept Gen Med, Matsue, Shimane, Japan