Three years into the pandemic: results of the longitudinal German COPSY study on youth mental health and health-related quality of life von Ravens-Sieberer, Ulrike, Devine, Janine, Napp, Ann-Kathrin, Kaman, Anne, Saftig, Lynn, Gilbert, Martha, Reiß, Franziska, Löffler, Constanze, Simon, Anja Miriam, Hurrelmann, Klaus, Walper, Sabine, Schlack, Robert, Hölling, Heike, Wieler, Lothar Heinz, Erhart, Michael

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