Didem Erdem1, Selmin Gülbahar2, Pembe Keskinoğlu3. 1. Department of Physical Medicine and Rehabilitation, Dokuz Eylül University Faculty of Medicine, Izmir, Turkey. didem_blue86@hotmail.com. 2. Department of Physical Medicine and Rehabilitation, Dokuz Eylül University Faculty of Medicine, Izmir, Turkey. 3. Department of Biostatics and Medical Informatics, Dokuz Eylül University Faculty of Medicine, Izmir, Turkey.