[1
]
Department of Physical Medicine and Rehabilitation, Østfold Hospital Trust, Grålum,
Norway.
[2
]
Department of Internal Medicine, Østfold Hospital Trust, Grålum, Norway.
[3
]
Department of Health and Welfare, Østfold University College, Halden, Norway.
[4
]
Centre for Human and Applied Physiological Sciences, School of Basic and Medical Biosciences,
Faculty of Life Sciences and Medicine, Department of Respiratory Medicine, Denmark
Hill, King's College London, London, UK.