[1] Jikei Univ, Sch Med, Kashiwa Hosp, Div Resp Med,Dept Internal Med, 163-1 Kashiwashita, Kashiwa, Chiba 2778567, Japan
[2] Jikei Univ, Sch Med, Kashiwa Hosp, Div Diagnost Pathol, Chiba, Japan
[3] Jikei Univ, Sch Med, Kashiwa Hosp, Div Cardiol, Chiba, Japan
[4] Jikei Univ, Sch Med, Dept Internal Med, Div Resp Med, Kashiwa, Chiba 2778567, Japan