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Heinonen, A., Gissler, M., Hindori-Mohangoo, A. D., Blondel, B., Klungsoyr, K., Verdenik, I., Mierzejewska, E., Velebil, P., Ólafsdóttir, H. S., Macfarlane, A. J. and Zeitlin, J. (2016). Variations in Multiple Birth Rates and Impact on Perinatal Outcomes in Europe. PLOS ONE, 11(3), doi: 10.1371/journal.pone.0149252