1. Department of Pediatrics, School of Medicine, Seoul Hospital, Soon Chun Hyang University, Seoul, Republic of Korea;
2. University-Industry Cooperation University, Konkuk University, Chungju-si, Republic of Korea;
3. Department of Biostatistics, Soonchunhyang Medical Center, Seoul, Republic of Korea;
4. Department of Political Sciences, Faculty of Social Sciences, University of Antwerp, Antwerp, Belgium;
5. Department of Nursing, Konkuk University, Chungju-si, Republic of Korea