1. Department of Computer Science, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen Ø, Copenhagen, Denmark.
2. Department of Cardiothoracic Surgery, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark.
3. Department of Respiratory Medicine, Herlev and Gentofte Hospital, Hellerup, Denmark.
4. Biomedical Imaging Group Rotterdam, Departments of Radiology and Nuclear Medicine, Erasmus MC, Rotterdam, The Netherlands.