Piirila P1*, Smith HJ2, Hodgson U3 and Sovijärvi AR1 1Unit of Clinical Physiology, Department of Clinical Physiology and Nuclear Medicine, HUS Medical, Imaging Centre, Helsinki University Central Hospital and Helsinki University, Helsinki, Finland 2Research in Respiratory Diagnostics, Bahrendorfer Str. 3, 12555 Berlin, Germany 3Heart and Lung Centre Helsinki, Helsinki University Central Hospita...