1 Department of Medical Statistics, Informatics and Health Economics, Innsbruck Medical University, Innsbruck, AustriaOslo Centre for Biostatistics and Epidemiology, University of Oslo, Oslo, NorwayInstitute of Epidemiology and Medical Biometry, Ulm University, Ulm, GermanyAgency for Preventive and Social Medicine, Bregenz, AustriaDepartment of Medical Statistics, Informatics and Health Economics, Innsbruck Medical University, Innsbruck, Austria, hanno.ulmer@i-med.ac.at.