Bonamy, A. E., Zeitlin, J. ., Piedvache, A. ., Maier, R. ., van Heijst, A. ., Varendi, H. ., … Research, G. E. (2018). Wide variation in severe neonatal morbidity among very preterm infants in European regions. Archives of Disease in Childhood. Fetal and Neonatal Edition. https://doi.org/10.1136/archdischild-2017-313697 (Original work published 2018)