Funding for this research was provided by:
the European Commission within the Sixth RTD Framework Programme (No.016181 (FOOD))
the European Commission within the Seventh RTD Framework Programme (No.266044)
Received: 23 July 2019
Accepted: 13 April 2020
First Online: 28 April 2020
Ethics approval and consent to participate
: All parents and their children above 12 years old signed informed consent, while younger children gave oral consent prior to the examinations in addition to the signed parental consent. Ethical approval was obtained from the ethics committees for all participating centres in each country: Ethics Committee, University Hospital, Gent, Belgium; Cyprus National Bioethics Committee, Nicosia, Cyprus; Tallinn Medical Research Ethics Committee, Tallinn, Estonia; Ethics Committee of the University of Bremen, Bremen, Germany; Egészségügyi Tudományos Tanács, Pécs, Hungary; Azienda Sanitaria Locale Avellino Comitato Etico, Avellino, Italy; Regionala Etikprövningsnämnden i Göteborg, Gothenburg, Sweden; Comité Ético de Investigación Clínica de Aragón, Zaragoza, Spain.
: Not applicable.
: The authors declare that they have no competing interests.