1. Department of Pediatric Dentistry; School of Dentistry; Yonsei University; Seoul Republic of Korea
2. BK21 PLUS Project; College of Dentistry; Yonsei University; Seoul Republic of Korea
3. Department of Pediatric Dentistry; College of Dentistry; Chonnam National University; Gwangju Republic of Korea
4. Department of Pediatric Dentistry; College of Dentistry; Pusan National University; Pusan Republic of Korea
5. Department of Advanced General Dentistry; College of Dentistry; Dankook University; Cheonan Republic of Korea
6. Department of Pediatric Dentistry; College of Dentistry; Yonsei University; Seoul Republic of Korea