[Effect of early-life antibiotic exposure on allergic symptoms in children aged 6-11 months and 18-23 months based a birth cohort study]. - Jiang L; Xie LL; Yan SQ; Cao H; Gu CL; Cai ZL; Gao GP; Wang H; Chen JF; Sha J; Tao FB (Zhonghua yu fang yi xue za zhi [Chinese journal of preventive medicine], 2021)