2. Statistics Korea. Infant, maternal and perinatal mortality statistics 2009-2011. Daejeon: Statistics Korea; 2012.
4. Bae CW. Perinatal care center system for high risk pregnancy and newborn in Japan. Korean J Perinatol 2011;22:269-279.
5. Shim JW, Kim MJ, Kim EK, Park HK, Song ES, Lee SM, Lee JH, Jin HS, Kim ES, Chang YS. Committee on Data Collection and Statistical Analysis, the Korean Society of Neonatology. The impact of neonatal care resources on regional variation in neonatal mortality among very low birthweight infants in Korea. Paediatr Perinat Epidemiol 2013;27:216-225.
6. Park WS. Development of national patient transfer system for the integrated approach in high-risk mother and infant care. Sejong: Ministry of Health and Welfare; 2015.
7. Chang YS, Ahn SY, Park WS. The establishment of the Korean Neonatal Network (KNN). Neonatal Med 2013;20:169-178.
8. Korean Neonatal Network. Korean Neonatal Network 2013 [Internet] Cheongju: National Research Institute of Health. 2013;cited 2016 Jun 22. Available from:
http://www.knn.or.kr/index.jsp
9. Executive Committee of Korean Neonatal Network. 2014 Annual report of Korean Neonatal Network. Seoul: Korea Centers for Disease Control and Prevention; 2015.
13. Ellsbury DL, Ursprung R. A primer on quality improvement methodology in neonatology. Clin Perinatol 2010;37:87-99.
14. Lee J, Kim HS. Current status of neonatal clinical trials in Korea. Neonatal Med 2014;21:1-9.
16. Fanaroff AA, Hack M, Walsh MC. The NICHD neonatal research network: changes in practice and outcomes during the first 15 years. Semin Perinatol 2003;27:281-287.
17. Smith PB, Ambalavanan N, Li L, Cotten CM, Laughon M, Walsh MC, Das A, Bell EF, Carlo WA, Stoll BJ, Shankaran S, Laptook AR, Higgins RD, Goldberg RN. Generic Database Subcommittee. Eunice Kennedy Shriver National Institute of Child Health Human Development Neonatal Research Network. Approach to infants born at 22 to 24 weeks' gestation: relationship to outcomes of more-mature infants. Pediatrics 2012;129:e1508-e1516.
18. Ahn SY, Chang YS, Sung DK, Sung SI, Yoo HS, Lee JH, Oh WI, Park WS. Mesenchymal stem cells prevent hydrocephalus after severe intraventricular hemorrhage. Stroke 2013;44:497-504.
19. Chang YS, Ahn SY, Yoo HS, Sung SI, Choi SJ, Oh WI, Park WS. Mesenchymal stem cells for bronchopulmonary dysplasia: phase 1 dose-escalation clinical trial. J Pediatr 2014;164:966-972.e6.
20. Fanos V, Van den Anker J, Noto A, Mussap M, Atzori L. Metabolomics in neonatology: fact or fiction? Semin Fetal Neonatal Med 2013;18:3-12.
21. Matamoros S, Gras-Leguen C, Le Vacon F, Potel G, de La Cochetiere MF. Development of intestinal microbiota in infants and its impact on health. Trends Microbiol 2013;21:167-173.
23. Halamek LP. Association of Medical School Pediatric Department Chairs, Inc. Teaching versus learning and the role of simulation-based training in pediatrics. J Pediatr 2007;151:329-330.