In the early phase of the COVID-19 pandemic, most cases were middle-aged and older people [ 3 , 4 ], but as the pandemic progressed, an increasing trend in children with COVID-19 infection was observed [ 4 ].
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Changes in COVID-19 Vaccine Acceptability among Parents with Children Aged 6-35 Months in China-Repeated Cross-Sectional Surveys in 2020 and 2021.
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