1 Department of Physical Medicine and Rehabilitation, Taipei Veterans General Hospital, Taipei, Taiwan.
2 School of Medicine, National Yang Ming Chiao Tung University, National Yang Ming University, Taipei, Taiwan.
3 Division of General Surgery, Department of Surgery, Shin-Kong Memorial Hospital, Taipei, Taiwan.
4 School of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan.
5 Department of Physical Medicine and Rehabilitation and Community and Geriatric Research Center, National Taiwan University Hospital, Bei-Hu Branch and National Taiwan University College of Medicine, Taipei, Taiwan.
6 Center for Regional Anesthesia and Pain Medicine, Wang-Fang Hospital, Taipei Medical University, Taipei, Taiwan.