Name Info Provider Link
free resource Scientific Electronic Library Online https://scielo.isciii.es/scielo.php?script=sci_arttext&pid=e201904025&lng=en&nrm=iso&tlng=en
free resource Revista Espanola de Salud Publica https://www.mscbs.gob.es/biblioPublic/publicaciones/recursos_propios/resp/revista_cdrom/VOL93/O_BREVES/RS93C_201904025.pdf