Protective Effect of Allergen Immunotherapy in Patients With Allergic Rhinitis and Asthma Against COVID-19 Infection: Observational, Nationwide, and Multicenter Study by Rundong Qin, Yan Feng, Huanping Zhang, Beibei Zhao, Wei Lei, Hongying Sun, Lili Zhi, Zhongsheng Zheng, Siqin Wang, Yafeng Yu, Shengxue Jiang, Changshan Liu, Xingkai Ma, Hui Ma, Huiying Wang, Hang Lin, Qiaojie He, Lingying Wu, Yingying Zhai, Honglue Lu, Shi Chen, Yan Ma, Xiaohong Jin, Shan Deng, Nanshan Zhong, Ruchong Chen, Jing Li

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