Therefore, at time point T=0 (shortly after admission to our center), participants are equipped with 3 inertial measurement units (1 at each wrist and 1 at the sternum). Additionally, a small wearable camera is mounted to the chest. The participants then return to their everyday life for 4 hours (no therapies, measurement period is in the evening). Afterwards, the equipment is removed again. To investigate responsiveness, the same protocol is being repeated 4 weeks later (time point T=1).