1. Department of Pediatrics, Pusan National University Children's Hospital, Yangsan, Korea.
2. Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea.
3. Infection Prevention and Control Department, Pusan National University Yangsan Hospital, Yangsan, Korea.
4. Department of Nursing, Pusan National University Yangsan Hospital, Yangsan, Korea.
5. Department of Laboratory Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.