Site principal investigator	Hospital
Marchien van Baal	Flevo ziekenhuis, Almere
Erik van Beek	Sint Antonius ziekenhuis, Nieuwegein
Mireille N Bekker	Birth Centre Wilhelmina Children Hospital/University Medical Centre Utrecht, Utrecht
Karin de Boer	Rijnstate hospital, Arnhem
Elisabeth MA Boormans	Meander Medical Centre, Amersfoort
Judith E Bosmans	VU University, dept. of Health Sciences
Hugo WF van Eijndhoven	Isala clinics, Zwolle
Mohamed El Alili	VU University, dept. of Health Sciences
Hanneke Feitsma	Haga hospital, Den Haag
Wouter JK Hehenkamp	Amsterdam UMC, VU University, Amsterdam
Majoie Hemelaar	Dijklander hospital – location Hoorn
Wietske Hermes	Haaglanden Medical Centre – Westeinde hospital, Den Haag
Esther Hink	Radboud University Nijmegen Medical Centre, Nijmegen
Anjoke JM Huisjes	Gelre hospital – location Apeldoorn
Ineke Janssen	Groene Hart hospital, Gouda
Kitty Kapiteijn	Reinier de Graaf hospital, Delft
Mesrure Kaplan	Röpcke‐Zweers hospital, Hardenberg
Paul JM van Kesteren	OLVG‐oost, Amsterdam
Judith OEH van Laar	Máxima Medical Centre, Veldhoven
Josje Langenveld	Zuyderland Medical Centre, Heerlen
Wouter J Meijer	Gelre hospital – location Zutphen
Angèle LM Oei	Bernhoven hospital, Uden
Eva Pajkrt	Amsterdam UMC, Univ of Amsterdam, Amsterdam
Dimitri NM Papatsonis	Amphia hospital, Breda
Celine M Radder	OLVG‐west, Amsterdam
Robbert JP Rijnders	Jeroen Bosch hospital, 's‐Hertogenbosch
Liesbeth Scheepers	Maastricht University Medical Centre, Research school ‘GROW’, Maastricht
Daniela H Schippers	Canisius‐Wilhelmina hospital, Nijmegen
Nico WE Schuitemaker	Diakonessenhuis, Utrecht
Marieke Sueters	Leiden University Medical Centre, Leiden
Harry Visser	Tergooi hospital, Blaricum
Huib AAM van Vliet	Catharina hospital, Eindhoven
Marloes de Vleeschouwer	Sint Franciscus Hospital, Rotterdam