[1] Agencia Salut Publ Catalunya, Barcelona 08005, Spain
[2] Agencia Salut Publ Barcelona, Barcelona, Spain
[3] CIBER Epidemiol & Salud Publ, Barcelona, Spain
[4] IIB St Pau, Madrid, Spain
[5] Univ Pompeu Fabra, Dept Ciencies Expt & Salut, Barcelona, Spain
[6] Univ Autonoma Barcelona, Dept Psicobiol & Metodol Ciencies Salut, E-08193 Barcelona, Spain