Citation
Bonita, Ruth,Strong, Kathleen,Courten, Maximilian de (2001) From surveys to surveillance. Rev Panam Salud Publica;10(4) 223-225,oct. 2001. Retrieved from http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49892001001000001&lng=en&nrm=iso&tlng=en