Explanation of variables (mixed models SAS output).
(PDF)Click here for additional data file.(PDF)Click here for additional data file.We are very grateful to all the participants in the study. We would also like to extend our great thanks to the INTER-ACT research group for their contribution to the data collection. University Hospital Antwerp, Gasthuiszusters Antwerp, St-Franciscus Hospital Heusden-Zolder, Hospital Oost-Limburg Genk, Jessa Hospital Hasselt, University Hospital Leuven, Wit-Gele Kruis Limburg, Kind & Gezin Limburg, Antwerp, study nurses and INTER-ACT coaches. We thank Patsy Harrington for her assistance in reviewing the English version.