1. Department of Pediatrics, School of Medicine, Soon Chun Hyang University, Seoul Hospital, Seoul, Republic of Korea,
2. Department of Pediatrics, School of Medicine, Soon Chun Hyang University, Cheonan Hospital, Cheonan, Republic of Korea,
3. Faculty of Art and Philosophy and Faculty of Political and Social Sciences, Ghent University, Belgium, and
4. Department of Nursing, Konkuk University, Chungju, Republic of Korea