1 Department of Anesthesiology, Mackay Memorial Hospital, Taipei, Taiwan; Mackay Medicine, Nursing and Management College, Taipei, Taiwan; Mackay Medical College, Taipei, Taiwan.
2 Department of Anesthesiology, Mackay Memorial Hospital, Taipei, Taiwan; Mackay Medicine, Nursing and Management College, Taipei, Taiwan; Mackay Medical College, Taipei, Taiwan; Department of Anesthesiology, National Taiwan University Hospital, Taipei, Taiwan. Electronic address: seancslin@gmail.com.