Developing and testing a protocol using a common data model for federated collection and analysis of national perinatal health indicators in Europe [version 2; peer review: 2 appro... oleh Marianne Philibert, Jennifer Zeitlin, Marzia Loghi, Francisco Estupiñán-Romero, Željka Draušnik, Luule Sakkeus, Mélanie Durox, Adela Recio Alcaide, Jelena Dimnjakovic, Jan Cap, Enrique Bernal Delgado, Janis Misins, Mika Gissler, Martin Thissen