Affiliation: | 1. Department of Cardiovascular Surgery, Kokura Memorial Hospital, Fukuoka; Kyoto, Japan;2. Department of Cardiovascular Surgery, Kyoto University Graduate School of Medicine, Kyoto, Japan;3. Department of Cardiovascular Surgery, Iwate Medical University, Memorial Heart Center, Iwate; Kyoto, Japan;4. Department of Biostatistics, Kyoto University School of Public Health, Kyoto, Japan |