1. Department of Nursing, Inje University Busan Paik Hospital, Busan, Korea.
2. Department of Nursing, Haeundae Bumin Hospital, Busan, Korea.
3. Graduate School of Public Health, Inje University, Busan, Korea.
4. Department of Pediatrics, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.