Effects of an app-based physical training for long- and post-COVID treatment (A PILOT) study: protocol for a multicentre randomised controlled trial by Birgit Friedmann-Bette, Andreas Nieß, Peter Deibert, Johannes Kirsten, Jana Schellenberg, Lynn Matits, Daniel Alexander Bizjak, Sarah Isabel Krieg, Lennart Mentz, Philipp Maier, Michèle Natale, Gunnar Erz

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