[1] Tohoku Univ, Sch Med, Dept Geriatr & Resp Med, Aoba Ku, Sendai, Miyagi 9808574, Japan
[2] Tohoku Univ, Inst Dev Aging & Canc, Dept Thorac Surg, Aoba Ku, Sendai, Miyagi 9808574, Japan
[3] Miyagi Canc Ctr Res Inst, Div Thorac Surg, Natori, Miyagi 9811293, Japan