Level and correlates of physical activity among children and adolescents with juvenile idiopathic arthritis compared to controls: results from a German nationwide prospective obser... by Florian Milatz, Sandra Hansmann, Jens Klotsche, Martina Niewerth, Tilmann Kallinich, Frank Dressler, Johannes-Peter Haas, Rainer Berendes, Gerd Horneff, Markus Hufnagel, Frank Weller-Heinemann, Daniel Windschall, Ralf Trauzeddel, Moritz Klaas, Hermann Girschick, Prasad T. Oommen, Ivan Foeldvari, Serdar Mustafa Cantez, Annette F. Jansson, Matthias Hartmann, Joachim Peitz-Kornbrust, Kirsten Minden

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