1 Department of Clinical and Molecular Medicine, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway.
2 Department of Pathology, St. Olavs Hospital, Trondheim University Hospital, N-7030 Trondheim, Norway.
3 Department of Pathology, Righospitalet, Copenhagen University Hospital, Frederik Vs vej 11, 2100 Copenhagen, Denmark.