Li, Xia, Qingfang Li, Xudong Wang, Man Lu, Jingjing Shen, and Qingmei Meng. “Pidotimod in the Treatment of Pediatric Recurrent Respiratory Tract Infection: Treatment of Pediatric Recurrent Respiratory Tract Infection”. Pakistan Journal of Medical Sciences 35, no. 4 (July 9, 2019). Accessed March 29, 2024. https://www.pjms.org.pk/index.php/pjms/article/view/82.