1 Health Sciences Research Center, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal; CHCB University Hospital, Covilhã, Portugal. Electronic address: sbravara@fcsaude.ubi.pt.
2 National Institute of Health Dr. Ricardo Jorge, Lisbon, Portugal.
3 Health Sciences Research Center, Faculty of Health Sciences, University of Beira Interior, Covilhã, Portugal; CHCB University Hospital, Covilhã, Portugal.
4 Smoke Free Partnership, Brussels, Belgium.
5 Association of European Cancer Leagues, Belgian Foundation Against Cancer, Brussels, Belgium.