1. Department of Physical Medicine and Rehabilitation, College of Medicine, Chung-Ang University, Seoul, Korea
2. Department of Physical Medicine and Rehabilitation, Centre hospitalier de l’Université de Montréal, Montreal, Canada
3. Department of Physical Medicine and Rehabilitation, Samsung Medical Center, Sungkyunkwan University, Seoul, Korea
4. Department of Rehabilitation Medicine, College of Medicine, Yeungnam University, Daegu, Republic of Korea