1. Yale School of Nursing, New Haven, U.S.A.
2. College of Nursing·The Research Institute of Nursing Science, Seoul National University, Seoul, Korea.
3. Department of Family Medicine, College of Medicine, Seoul National University, Seoul, Korea.
4. Department of Rehabilitation Medicine, College of Medicine, Seoul National University, Seoul, Korea.
5. Department of Physical Education, Seoul National University, Seoul, Korea.
6. Seoul Women's College of Nursing, Seoul, Korea.