1College of Nursing, Yonsei University, Seoul 120-752, Korea.
2College of Nursing, University of Illinois at Chicago, 842 S. Damen Ave., Chicago, IL, 60607, USA.
3College of Medicine, Ajou University, San 5, Wonchon-Dong, Yeongtong-Gu, Suwon, 443-721, Korea.
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