1. Hospital Senhora da Oliveira Gastrenterology Department – Guimarães Portugal
2. Life and Health Sciences Research Institute (ICVS) School of Medicine University of Minho BragaPortugal
3. ICVS/3B's PT Government Associate Laboratory Guimarães/BragaPortugal
4. Western Oporto Public Health Department Portugal
5. EPIUnit – Institute of Public Health University of Porto Porto Portugal