1. From the Department of Anesthesia and Intensive Care (E.Ö., L.E.) and the Department of Radiology (A.T.), Västerås and Köping Hospital, Västerås, Sweden; Center for Clinical Research, Västerås, Sweden (M.E.); Department of Surgical Sciences, Anesthesiology and Intensive Care, Uppsala University, Uppsala, Sweden (H.Z.); and Department of Medical Sciences, Clinical Physiology, Uppsala University, U