1. Department of Surgery; Chosun University College of Medicine; Gwangju Korea
2. Department of Nursing; Asan Medical Center; Seoul Korea
3. Department of Surgery; University of Ulsan College of Medicine, Asan Medical Center; Seoul Korea
4. Department of Nursing; University of Ulsan College of Medicine; Ulsan Korea
5. Department of Psychiatry; University of Ulsan College of Medicine, Asan Medical Center; Seoul Korea