Adolescents’ symptoms of anxiety and depression before and during the Covid-19 outbreak :   A prospective population-based study of teenagers in Norway / 
Gertrud Sofie Hafstad [and threes others] 
<br/><br/>The Lancet Regional Health Europe Vol. 5, 100093, June 01, 2021<br/>DOI:https://doi.org/10.1016/j.lanepe. 2021.100093 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pandemics<br/>Sars-Cov-2<br/>COVID-19<br/>Anxiety<br/>Depression<br/>Adolescent