1. Department of Nuclear Medicine, Kaohsiung Veterans General Hospital, Kaohsiung City 81314, Taiwan
2. Department of Physical Medicine and Rehabilitation, Kaohsiung Veterans General Hospital, Kaohsiung City 813414, Taiwan
3. Department of Physical Medicine and Rehabilitation, Tri-Service General Hospital and National Defense Medical Center, Taipei City 11490, Taiwan
4. Institute of Biomedical Sciences, College of Medicine, National Sun Yat-sen University, Kaohsiung City 804, Taiwan