1. Department of Biomedical Engineering, Dongju College University, 15-1 San, Goejeong-dong, Saha-gu, Busan 602-715, Korea
2. Department of Nursing, Tongmyung University, 428, Sin sun-Ro, Nam-gu, Busan 608-711, Korea
3. Department of Nursing, Dong eui University, Gaya-dong, Eomgwang-ro, Busanjin-gu, Busan 614-714, Korea