作者单位:Department of Surgical and Perioperative Sciences/Surgery, Ume? University, SE-901 85 Ume?, Sweden[1]Department of Medical Biosciences/Pathology, Ume? University, SE-901 85 Ume?, Sweden[2]Department of Medical Biosciences/Medical and Clinical Genetics, Ume? University, SE-901 85 Ume?,[3]