De Belder, Lize, Anne Malfroot, Yvan Vandenplas, Inge Gies, and Elke De Wachter. 2022. “Prophylactic Azithromycin in Pre-Schoolers With Chronic Respiratory Symptoms: A Longitudinal Survey”. Belgian Journal of Paediatrics 24 (3). http://belgjpaediatrics.com/index.php/bjp/article/view/30.