1. Department of Physical Medicine and Rehabilitation; Tri-Service General Hospital, School of Medicine, National Defense Medical Center; No. 325, Sec. 2, Cheng-Kung Road, Neihu District, Taipei Taiwan 11490 Republic of China
2. Integrated Pain Management Center, Tri-Service General Hospital, School of Medicine, National Defense Medical Center; Taipei Taiwan Republic of China
3. Department of Medicine; School of Medicine, National Defense Medical Center; Taipei Taiwan Republic of China
4. Department of Neurology; Tri-Service General Hospital, School of Medicine, National Defense Medical Center; Taipei Taiwan Republic of China
5. Graduate Institute of Medical Science, School of Medicine, National Defense Medical Center; Taipei Taiwan Republic of China