Long-term effects of vitamin D on exacerbation rate, health care utilization and lung function in children with asthma - Li, Qinyuan; Zhou, Qi; Zhang, Guangli; Tian, Xiaoyin; Chen, Yaolong; Cun, Yupeng; Xu, Ximing; Luo, Zhengxiu (Annals of Translational Medicine, 2022)