J. M. Belizán,N. Minckas,E. M. McClure,S. Saleem,J. L. Moore,S. S. Goudar,F. Esamai,A. Patel,E. Chomba,A. L. Garces,F. Althabe,M. S. Harrison,N. F. Krebs,R. J. Derman,W. A. Carlo,E. A. Liechty,P. L. Hibberd,P. M. Buekens and R. L. Goldenberg. An approach to identify a minimum and rational proportion of caesarean sections in resource-poor settings: a global network study. Lancet Glob Health. 2018;6(8):10.1016/s2214-109x(18)30241-9.