[1] Japanese Assoc Thorac Surg, Comm Sci Affairs, Tokyo, Japan
[2] Keio Univ, Dept Cardiovasc Surg, Shinjuku Ku, 35 Shinanomachi, Tokyo, Japan
[3] Hiroshima Univ, Dept Surg Oncol, Hiroshima, Japan
[4] Natl Hosp Org Kyushu Canc Ctr, Dept Gastroenterol Surg, Fukuoka, Japan
[5] Osaka Univ, Dept Gastroenterol Surg, Suita, Osaka, Japan
[6] Jichi Med Univ, Dept Thorac Surg, Shimotsuke, Tochigi, Japan
[7] Dokkyo Med, Sch Med, Dept Cardiac & Vasc Surg, Mibu, Tochigi, Japan
[8] Univ Tokyo Hosp, Dept Cardiac Surg, Tokyo, Japan
[9] Gifu Univ Hosp, Dept Gen Thorac Surg, Gifu, Japan
[10] Natl Cerebral & Cardiovasc Ctr, Dept Cardiovasc Surg, Suita, Osaka, Japan
[11] Univ Tokyo, Grad Sch Med, Dept Healthcare Qual Assessment, Tokyo, Japan
[12] Keio Univ, Dept Hlth Policy & Management, Tokyo, Japan
[13] Toho Univ, Dept Cardiovasc Surg, Sakura Med Ctr, Sakura, Japan
[14] Kagoshima Univ, Grad Sch Med, Dept Digest Surg Breast & Thyroid Surg, Kagoshima, Japan
[15] Tokai Univ, Dept Gastroenterol Surg, Sch Med, Isehara, Kanagawa, Japan
[16] Tohoku Univ, Div Cardiovasc Surg, Grad Sch Med, Sendai, Miyagi, Japan
[17] St Marianna Univ, Dept Chest Surg, Sch Med, Kawasaki, Kanagawa, Japan
[18] Univ Tsukuba, Dept Thorac Surg, Tsukuba, Ibaraki, Japan
[19] Mitsui Mem Hosp, Dept Cardiovasc Surg, Tokyo, Japan
[20] Kawasaki Med Sch, Dept Cardiovasc Surg, Kurashiki, Okayama, Japan
[21] Univ Tokushima, Grad Sch, Dept Thorac Endocrine Surg & Oncol, Inst BioMed, Tokushima, Japan
[22] Gunma Univ, Dept Gen Surg Sci, Div Cardiovasc Surg, Maebashi, Gunma, Japan
[23] Japanese Fdn Canc Res, Canc Inst Hosp, Dept Surg Gastroenterol, Tokyo, Japan
[24] Kyoto Univ, Grad Sch Med, Dept Cardiovasc Surg, Kyoto, Japan
[25] Chunichi Hosp, Nagoya, Aichi, Japan
[26] Takatsuki Gen Hosp, Cardioaort Ctr, Takatsuki, Osaka, Japan
[27] Niigata Univ, Grad Sch Med & Dent Sci, Div Thorac & Cardiovasc Surg, Niigata, Japan
[28] Osaka Univ, Grad Sch Med, Dept Cardiovasc Surg, Osaka, Japan