[1] Univ Porto, Inst Saude Publ, EPIUnit, Porto, Portugal
[2] Univ Porto, Fac Med, Dept Ciencias Saude Publ & Forenses & Educ Med, Alameda Prof Hernani Monteiro, P-4200319 Porto, Portugal
[3] Univ Porto, Grp Epidemiol Cancro CI IPOP, Inst Portugues Oncol Porto, Rua Dr Antonio Bernardino Almeida, Porto, Portugal
[4] Univ Porto, Inst Portugues Oncol Porto, Rua Dr Antonio Bernardino Almeida, Porto, Portugal
[5] Univ Porto, Inst Ciencias Biomed Abel Salazar, Porto, Portugal