[1] Kyoto Univ Hosp, Dept Thorac Surg, Sakyo Ku, 54 Kawaharacho, Kyoto 6068507, Japan
[2] Nishi Kobe Med Ctr, Dept Thorac Surg, Nishi Ku, 5-7-1 Koujidai, Kobe, Hyogo 6512273, Japan
[3] Tenri Hosp, Dept Thorac Surg, 200 Mishimacho, Tenri, Nara 6328552, Japan
[4] Kitano Hosp, Tazuke Kofukai Med Inst, Dept Thorac Surg, 2-4-20 Ougimachi, Osaka 5308480, Japan
[5] Nagara Med Ctr, Dept Thorac Surg, 1300-7 Nagara, Gifu 5028558, Japan
[6] Otsu Red Cross Hosp, Dept Thorac Surg, 1-1-35 Nagara, Otsu, Shiga 5208511, Japan