Effectiveness of an interactive telerehabilitation system with home-based exercise training in patients after total hip or knee replacement: study protocol for a multicenter, super... oleh Sarah Eichler, Sophie Rabe, Annett Salzwedel, Steffen Müller, Josefine Stoll, Nina Tilgner, Michael John, Karl Wegscheider, Frank Mayer, Heinz Völler, on behalf of the ReMove-It study group