[1
]
Department of Cardiothoracic Surgery, Oslo University Hospital-Rikshospitalet, Oslo,
Norway; Faculty of Medicine, University of Oslo, Oslo, Norway. Electronic address:
anders.bugge@medisin.uio.no.
[2
]
Department of Respiratory Medicine, Oslo University Hospital-Rikshospitalet, Oslo,
Norway.
[3
]
Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway.
[4
]
Department of Cardiothoracic Surgery, Oslo University Hospital-Rikshospitalet, Oslo,
Norway; Faculty of Medicine, University of Oslo, Oslo, Norway.
[5
]
Faculty of Medicine, University of Oslo, Oslo, Norway; Department of Respiratory Medicine,
Oslo University Hospital-Rikshospitalet, Oslo, Norway.