School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan. Cancer Center, Yuan's General Hospital, Kaohsiung, Taiwan. Department of Health Business Administration, Meiho University, Pingtung, Taiwan. Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan. Center for Evidence-Based Health Care, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan. Cochrane Taiwan, Taipei Medical University, Taipei, Taiwan. Center for Evidence-Based Health Care, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan: kelvintam@h.tmu.edu.tw Cochrane Taiwan, Taipei Medical University, Taipei, Taiwan: kelvintam@h.tmu.edu.tw Division of General Surgery, Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan: kelvintam@h.tmu.edu.tw Division of General Surgery, Department of Surgery, Shuang Ho Hospital, Taipei Medical University, New Taipei City, Taiwan: kelvintam@h.tmu.edu.tw