1. Division of Surgery (Y.F., E.N.), Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, SE-182 88 Stockholm, Sweden
2. Department of Medical Sciences (P.M.H.), Uppsala University, SE-751 05 Uppsala, Sweden
3. Department of Biomedical Sciences (J.J.H.), The Panum Institute, University of Copenhagen, 2200 Copenhagen, Denmark