Li, Xia, Qingfang Li, Xudong Wang, Man Lu, Jingjing Shen, and Qingmei Meng. 2019. “Pidotimod in the Treatment of Pediatric Recurrent Respiratory Tract Infection: Treatment of Pediatric Recurrent Respiratory Tract Infection”. Pakistan Journal of Medical Sciences 35 (4). https://doi.org/10.12669/pjms.35.4.82.