1 Department of Public and Community Health, School of Public Health, University of West Attica, Athens, Greece.
2 REFiT Barcelona Research Group, Parc Sanitari Pere Virgili and Vall d'Hebron Institute of Research (VHIR), Edifici Montseny 0, c Esteve Terrades 30, 08023, Barcelona, Spain. minzitari@perevirgili.cat.
3 Faculty of Healthcare Sciences, Universitat Oberta de Catalunya (UOC), Barcelona, Spain. minzitari@perevirgili.cat.