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Cohort study on pathogenic changes of nasopharyngeal in preschool children before and after going to kindergarten
LUO Chun-chou, CAI Hui-zhen, ZHANG Yue-kui, CAI Meng-yun, LIN Xiu-mei, LIU Ling-hong, YAN Lin, XIE Li-qin
Chinese Journal of Evidence -Based Pediatric . 2019, (3): 201 -204 .  DOI: 10.3969/j.issn.1673-5501.2019.03.008