Physical Activity and Sedentary Behaviour Patterns in 326 Persons with COPD before Starting a Pulmonary Rehabilitation: A Cluster Analysis - Geidl, Wolfgang; Carl, Johannes; Cassar, Samuel; Lehbert, Nicola; Mino, Eriselda; Wittmann, Michael; Wagner, Rupert; Schultz, Konrad; Pfeifer, Klaus (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2019)