Effect of the COVID-19 pandemic on adolescent mental health and substance use up to March, 2022, in Iceland: a repeated, cross-sectional, population-based studyIngibjörg Eva Þórisdóttir, Thorhildur Halldorsdottir, Saeunn Yr Oskarsdottir et al.|The Lancet Child & Adolescent Health|2023Cited by 56