COVID-19(27) cohort study(22) outcome(19) age(19) participant(18) children(18) SARS-CoV-2(16) 95% CI(16) Infection(16) Importance(15) objective(15) finding(15) exposure(15) Point(15) measure(15) Result(15) Relevance(15) setting(15) SARS-COV-2 infection(13) COVID-19 pandemic(12) coronavirus(10) association(10) median(10) assessment(10) antibody(10) Infant(10) Maternal(10) acute respiratory syndrome(10) Diagnosis(9) cross-sectional(9)