Rising cesarean rates of twin deliveries in Germany from 1990 to 2012 Συγγραφείς: Kyvernitakis A, Kyvernitakis I, Karageorgiadis AS, Misselwitz B, Papaspyrou G, Kalder M, Schmidt S. Z Geburtshilfe Neonatol. 2013; 217:177-182.