Grylka-Baeschlin, S., Hess, T. H., Erdin, R., Prentl, E. and Pehlke-Milde, J. (2018) “Availability and accessibility of perinatal data for the Robson classification of caesarean sections in Switzerland”, Swiss Medical Weekly, 148(0304), p. w14578. doi: 10.4414/smw.2018.14578.