1. Department of Pediatric Dentistry; School of Dentistry; Kyung Hee University; Seoul Korea
2. Department of Clinical Pharmacology and Therapeutics; College of Medicine; Kyung Hee University; Seoul Korea
3. Department of Pediatric Dentistry; College of Dentistry; Yonsei University; Seoul Korea
4. Oral Science Research Center; College of Dentistry; Yonsei University; Seoul Korea
5. Department of Preventive Dentistry and Public Oral Health; College of Dentistry; Yonsei University; Seoul Korea
6. Department of Pediatric Dentistry; School of Dentistry; Seoul National University; Seoul Korea