H. Blencowe,S. Cousens,D. Chou,M. Oestergaard,L. Say,A. B. Moller,M. Kinney and J. Lawn. Born too soon: the global epidemiology of 15 million preterm births. Reprod Health. 2013;10 Suppl 1(Suppl 1):10.1186/1742-4755-10-s1-s2.
H. Blencowe,S. Cousens,D. Chou,M. Oestergaard,L. Say,A. B. Moller,M. Kinney and J. Lawn. Born too soon: the global epidemiology of 15 million preterm births. Reprod Health. 2013;10 Suppl 1(Suppl 1):10.1186/1742-4755-10-s1-s2.