[1] Ctr Salud, Cantabria, Spain
[2] Ctr Salud, Huelva, Spain
[3] Univ Valencia, Dept Med Prevent & Salud Publ, Unidad Invest Epidemiol Genet & Mol, Valencia, Spain
[4] Ctr Atenc Primaria, Valencia, Spain
[5] Ctr Salud Napoles & Sicilia, Valencia, Spain
[6] Hosp Univ La Fe, Serv Anal Clin, Valencia, Spain