1. Department of Physical Therapy, The Graduate of School, Sahmyook University, Republic of Korea
2. Institute of Rehabilitation Science, Sahmyook University, Republic of Korea
3. Motion Analysis Laboratory, Department of Kinesiology, Texas Woman’s University, USA
4. Department of Physical Therapy, Sahmyook University: 815 Hwarangro, Nowon-gu, Seoul 139-742, Republic of Korea