[1] Showa Univ, Sch Med, Div Rheumatol, Dept Med, Yokohama, Japan
[2] Showa Univ, Sch Nursing & Rehabil Sci, Dept Nursing, Yokohama, Japan
[3] Showa Univ, Sch Med, Dept Psychiat, Yokohama, Japan
[4] Katsuyama Clin, Dept Psychosomat Med, Yamanashi, Japan