1. College of Nursing, Eulji University, Uijeongbu, Korea.
2. College of Nursing, Seoul National University, Seoul, Korea.
3. Center for World-leading Human-care Nurse Leaders for the Future by Brain Korea 21 (BK 21) Four Project, College of Nursing, Seoul National University, Seoul, Korea.
4. The Research Institute of Nursing Science, College of Nursing, Seoul National University, Seoul, Korea.
5. Department of Clinical Nursing, University of Ulsan, Seoul, Korea.
6. Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.