Acknowledgement
We wish to express our gratitude to the nurses and staff at the
Department of Cardiothoracic and Vascular Surgery and the Department of
Radiology, Örebro University Hospital. Special thanks to the research
staff; Kerstin Bergström, Catarina Gerdevåg, Lenore Haugland and Lennart
Johannesson for their thorough collection of data and kind care of the
patients.