[1] Sasebo City Gen Hosp, Dept Resp Med, Sasebo, Nagasaki, Japan
[2] Nagasaki Univ, Sch Med, Dept Internal Med 2, Nagasaki, Nagasaki, Japan
[3] Sasebo City Gen Hosp, Dept Pathol, Sasebo, Nagasaki, Japan
[4] Japan Red Cross Nagasaki Genbaku Hosp, Dept Resp Med, Nagasaki, Nagasaki, Japan