1. Excellence Cluster Cardio‐Pulmonary Institute (CPI) University of Giessen and Marburg Lung Center (UGMLC) Member of the German Center for Lung Research (DZL) Justus‐Liebig‐University, Giessen D‐35392 Giessen Germany
2. Department of Engineering Sciences and Mathematics Luleå University of Technology Luleå SE‐97187 Sweden