1. Division of Colorectal Surgery, Department of Surgery Ditmanson Medical Foundation Chia‐Yi Christian Hospital Chiayi City Taiwan
2. Institute of Statistical Science, Academia Sinica Taipei Taiwan
3. Clinical Research Center Ditmanson Medical Foundation Chia‐Yi Christian Hospital Chiayi Taiwan
4. Department of Radiation Oncology Ditmanson Medical Foundation Chia‐Yi Christian Hospital Chiayi Taiwan
5. Division of Colorectal Surgery, Department of Surgery Antai Medical Care Coporation Antai Tian‐Shang Memorial Hospital Pingtung Taiwan