1 Department of Surgery, Song Shan Branch, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
2 Division of General Surgery, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.
3 Department of Anesthesiology, Hualien Armed Forces General Hospital, National Defense Medical Center, Hualien, Taiwan.
4 Emergency Department, Taipei Veterans General Hospital, Taipei, Taiwan; Division of Emergency Medicine, Taipei Veterans General Hospital Yuan-Shan and Su-Ao Branch, Yilan, Taiwan; Department of Emergency Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan.