[1] Kyoto Univ, Grad Sch Med, Dept Resp Med, Kyoto, Japan
[2] Natl Hosp Org, Dept Cardiol, Kyoto Med Ctr, Kyoto, Japan
[3] Kyoto Univ, Resp Care & Sleep Control Med, Grad Sch Med, Kyoto, Japan
[4] Kyoto Univ, Dept Cardiovasc Med, Grad Sch Med, Kyoto, Japan
[5] Tenri Hosp, Dept Cardiovasc Med, Tenri, Japan
[6] Hirakata Kohsai Hosp, Dept Cardiol, Hirakata, Japan
[7] Nihon Univ, Dept Sleep Med & Resp Care, Div Sleep Med, Sch Med, Tokyo, Japan