Citation
Barillas, Edgar (1998) Public health services: should they respond to demand or necessity?. Rev Panam Salud Publica;3(5) 357-358,mayo 1998. Retrieved from http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49891998000500019&lng=pt&nrm=iso&tlng=en