Mitigating Feelings of Loneliness and Depression by Means of Web-Based or Print-Based Physical Activity Interventions: Pooled Analysis of 2 Community-Based Intervention Trials von Lippke, Sonia, Ratz, Tiara, Keller, Franziska Maria, Juljugin, Dennis, Peters, Manuela, Pischke, Claudia, Voelcker-Rehage, Claudia

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