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. 2022 Aug 18;71(5):570–578. doi: 10.1016/j.jadohealth.2022.06.022

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© 2022 Society for Adolescent Health and Medicine. Published by Elsevier Inc.

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Percentages of children and adolescents with low, normal, and high health-related quality of life measured prior to the COVID-19 pandemic (BELLA study), in Wave 1, Wave 2, and Wave 3 of the COPSY study.