Effects of nutritional intervention strategies in the primary prevention of overweight and obesity in school settings: systematic review and network meta-analysis by Joerg J Meerpohl, Lukas Schwingshackl, Guido Schwarzer, Jürgen M Steinacker, Edris Nury, Blin Nagavci, Georg Hoffmann, Jakub Morze, Janine Wendt, Julia Stadelmaier, Kathrin Grummich, Claudia M Angele, Johanna Conrad, Daniela Schmid

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