Surgun, E., P. Lepage, P. Smeesters, and C. Mignon. “Incidence and Epidemiology of Parapneumonic Pleural Effusion in Children before and During Pneumococcal Conjugated Vaccination Era in Belgium (2000-2019)”. Belgian Journal of Paediatrics, vol. 24, no. 4, Jan. 2023, pp. 257-65, http://belgjpaediatrics.com/index.php/bjp/article/view/58.