1. Department of Physical & Rehabilitation Medicine, School of Medicine, Inha University, Incheon, Korea.
2. Department of Physical & Rehabilitation Medicine, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Physical & Rehabilitation Medicine, Korea University School of Medicine, Seoul, Korea.
4. Department of Physical & Rehabilitation Medicine, Ajou University College of Medicine, Suwon, Korea.
5. Department of Physical & Rehabilitation Medicine, The Catholic University of Korea School of Medicine, Seoul, Korea.
6. Department of Physical & Rehabilitation Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea.
7. Department of Physical & Rehabilitation Medicine, University of Ulsan College of Medicine, Seoul, Korea.
8. Department of Physical & Rehabilitation Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
9. Department of Physical & Rehabilitation Medicine, Kyung Hee University College of Medicine, Seoul, Korea.
10. Department of Physical & Rehabilitation Medicine, Chonnam National University Medical School, Gwangju, Korea.
11. Department of Physical & Rehabilitation Medicine, National Rehabilitation Center, Seoul, Korea.
12. Department of Physical & Rehabilitation Medicine, The Catholic University of Korea School of Medicine, St. Vincent's Hospital, Suwon, Korea.