Validation of the accuracy of the childhood asthma model for clinical decision support: a study protocol - Dong, Na; Wu, Beirong; Yin, Bingru; Dong, Wei; Jin, Xiaoqun; Wang, Miao; Xu, Xiuhe; Zhi, Canghong; Zhao, Dandan; Lu, Min; Gu, Haoxiang; Qiao, Rong (Journal of Thoracic Disease, 2021)