1. Birth [Internet]. Statistic Korea, Korean Statistical Information Service. c1996;cited 2011 Nov 11. Daejeon: Statistics Korea, Available from
http://www.kosis.kr.
2. Moon JY, Hahn WH, Shim KS, Chang JY, Bae CW. Changes of maternal age distribution in live births and incidence of low birth weight infants in advanced maternal age group in Korea. Korean J Perinatol 2011;22:30–36.
4. Chang YS. The Committee on Data Collection and Statistics of the Korean Society of Neonatology. The survey on the actual conditions of neonatal intensive care units and analysis of survival rate of high-risk newborn infants. 2010 Report of Management Center for Health Promotion 2010. 2010;Seoul: The Korean Society of Neonatology.
5. Committee on Perinatal Health. Toward improving the outcome of pregnancy: recommendations for the regional development of maternal and perinatal health services. 1976;New York: National Foundation-March of Dimes.
6. Bode MM, O'shea TM, Metzguer KR, Stiles AD. Perinatal regionalization and neonatal mortality in North Carolina, 1968-1994. Am J Obstet Gynecol 2001;184:1302–1307.
7. Ryan GM Jr. Toward improving the outcome of pregnancy recommendations for the regional development of perinatal health services. Obstet Gynecol 1975;46:375–384.
9. Committee on Perinatal Health. March of Dimes Birth Defects Foundation. Toward improving the outcome of pregnancy: the 90s and beyond. 1993;New York: March of Dimes Birth Defects Foundation.
10. Stark AR. American Academy of Pediatrics Committee on Fetus and Newborn. Levels of neonatal care. Pediatrics 2004;114:1341–1347.
12. Kempley ST, Baki Y, Hayter G, Ratnavel N, Cavazzoni E, Reyes T, et al. Effect of a centralised transfer service on characteristics of inter-hospital neonatal transfers. Arch Dis Child Fetal Neonatal Ed 2007;92:F185–F188.
13. Bae CW. Bench-marking of Japanese perinatal center system for improving maternal and neonatal outcome in Korea. Korean J Perinatol 2010;21:129–139.
15. Japan Ministry of Health Labor and Welfare [Internet]. c2011;cited 2011 Nov 11. Tokyo: Japan Ministry of Health Labor and Welfare, Available from:
http://www.mhlw.go.jp/english/.
17. Itabashi K, Horiuchi T, Kusuda S, Kabe K, Itani Y, Nakamura T, et al. Mortality rates for extremely low birth weight infants born in Japan in 2005. Pediatrics 2009;123:445–450.
18. Shin SM. The Committee on Data Collection and Statistics of the Korean Society of Neonatology. Establishment of and effective health care system for high risk newborn infants. 2006 Report of Management Center for Health Promotion 2006. 2006;Seoul: The Korean Society of Neonatology.
19. Kang BH, Jung KA, Hahn WH, Shim KS, Chang JY, Bae CW. Regional analysis on the incidence of preterm and low birth weight infant and the current situation on the neonatal intensive care units in Korea, 2009. J Korean Soc Neonatol 2011;18:70–75.