E. J. Jhonston, J. Bravo-Espinoza, and G. Meza Sánchez, “Experience of the sentinel surveillance on the border of Peru, Colombia and Brazil”, Rev Peru Med Exp Salud Publica, vol. 32, no. 4, pp. 821–822, Dec. 2015, doi: 10.17843/rpmesp.2015.324.1782.