1. Department of Medical Biosciences/Pathology, Umeå University, SE - 901 85 Umeå, Sweden
2. Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy
3. RECAMO, Masaryk Memorial Cancer Institute, 656 53 Brno, Czech Republic
4. Institut de Génétique Moléculaire, Université Paris 7, Hôpital St. Louis, 75010 Paris, France
5. Department of Clinical Sciences/ENT, Umeå University, SE - 901 85 Umeå, Sweden