E. M. Lackritz,C. B. Wilson,A. E. Guttmacher,J. L. Howse,C. M. Engmann,C. E. Rubens,E. M. Mason,L. J. Muglia,M. G. Gravett,R. L. Goldenberg,J. C. Murray,C. Y. Spong and J. L. Simpson. A solution pathway for preterm birth: accelerating a priority research agenda. Lancet Glob Health. 2013;1(6):10.1016/s2214-109x(13)70120-7.