1. Department of Thoracic Surgery; Chang Gung Memorial Hospital; Taoyuan Taiwan
2. Department of Surgery; Tokyo Medical and Dental University; Tokyo Japan
3. Department of Digestive Tract and General Surgery; Saitama Medical Center, Saitama Medical University; Saitama Japan
4. Research Team for Geriatric Diseases (Human Tissue Research Group); Tokyo Metropolitan Institute of Gerontology; Tokyo Japan
5. Department of Pathology; Beth Israel Deaconess Medical Center; Boston Massachusetts