Measurement system for unsupervised standardized assessments of timed up and go test and 5 times chair rise test in community settings: a usability study - Fudickar, Sebastian; Pauls, Alexander; Lau, Sandra; Hellmers, Sandra; Gebel, Konstantin; Diekmann, Rebecca; Bauer, Jürgen M.; Hein, Andreas; Koppelin, Frauke (Sensors, 2022)