Villegas, D., Echandía-Villegas, C. and Echandía, C. (2012) “Afebrile pneumonia (whooping cough) syndrome in infants at Hospital Universitario del Valle, Cali, 2001-2007”, Colombia Médica, 43(2), pp. 114-118. doi: 10.25100/cm.v43i2.1138.