A fatal case of diphtheria in Belgium, 24 March 2016, https://ecdc.europa.eu/sites/portal/files/media/en/publications/Publications/RRA-Diphtheria-Belgium.pdf][7: 2016 WHO/UNICEF Estimates of National Immunization Coverage http://www.who.int/immunization/monitoring_surveillance/who-immuniz.pdf?ua=1]
A fatal case of diphtheria in Belgium, 24 March 2016, (Un caso mortal de difteria en Bélgica, 24 de marzo de 2016) https://ecdc.europa.eu/sites/portal/files/media/en/publications/Publications/RRA-Diphtheria-Belgium.pdf][7: 2016 WHO/UNICEF Estimates of National Immunization Coverage (2016 OMS/UNICEF Estimaciones sobre cobertura nacional de vacunación) http://www.who.int/immunization/monitoring_surveillance/who-immuniz.pdf?ua=1]