Serodiagnosis of whooping cough in Belgium: results of the National Reference Centre for Bordetella pertussis anno 2013., Duterme, Sophie, Vanhoof Raymond, Vanderpas Jean, Piérard Denis, and Huygen Kris , Acta Clin Belg, 2016 Apr, Volume 71, Issue 2, Number 91, p.86-91, (2016)