1. Ankara City Hospital, Department of Physical Medicine and Rehabilitation, Bilkent, Ankara, Turkey.
2. Department of Physical Medicine and Rehabilitation, Kastamonu University Medical Faculty, Kastamonu, Turkey.
3. Department of Physical Medicine and Rehabilitation, University of Hacettepe Faculty of Medicine, Ankara, Turkey.
4. Department of Physical Medicine and Rehabilitation, Gulhane Education and Research Hospital, Ankara, Turkey.
5. Department of Biostatistics, University of Hacettepe Faculty of Medicine, Ankara, Turkey.