1 Department of Life sciences and Medicine, Faculty of Science, Technology and Medicine, University of Luxembourg, Eschsur-Alzette, Grand Duchy of Luxembourg.
2 Department of Public Health, Biostatistics and Medical Informatics Research group, Vrije Universiteit Brussel, Brussels, Belgium.
3 Ecole Nationale de Sante du Luxembourg, Strassen, Grand Duchy of Luxembourg.
4 Association Luxembourgeoise des Sages-Femmes, Luxembourg-ville, Grand Duchy of Luxembourg.
5 Centre Hospitalier du Nord, Ettelbruck, Grand Duchy of Luxembourg.
6 Hiewanspraxis A gudden Hann, Wiltz, Grand Duchy of Luxembourg.
7 Hopitaux Robert Schuman, Kirchberg, Grand Duchy of Luxembourg.
8 Hiewannepraxis am Suden, Esch-sur-Alzette, Grand Duchy of Luxembourg.
9 Institut de recherche Sante et Societe, Universite Catholique de Louvain, Belgium.