n/a 12–17 years COVID-19 vaccine BNT162b2 COVID-19 COVID-19 vaccination COVID-19 vaccine Data quality GeomBot K-means Kodály approach OpenStreetMap Pfizer RT-PCR-positive SARS-CoV-2 Seoul Education Longitudinal Study T-cell responses action research adolescent adverse event adverse events adverse reactions allergy antibody response anxiety assessment for learning attrition autoimmune booster causal evidence children