1. Transplantation Laboratory; University of Helsinki, Haartmaninkatu 3; P.O. Box 21 00014 Helsinki Finland
2. Hospital District of Helsinki and Uusimaa Laboratory; Helsinki University Hospital; 00290 Helsinki Finland
3. Department of Otorhinolaryngology-Head and Neck Surgery; University of Helsinki and Helsinki University Hospital; 00130 Helsinki Finland
4. Division of Ear; Nose and Throat Diseases; Department of Clinical Sciences; Intervention and Technology; Karolinska Institutet and Karolinska Hospital; 11382 Stockholm Sweden
5. Department of Biosciences; University of Helsinki; P.O. Box 65 00014 Helsinki Finland
6. Department of Biosciences and Nutrition; Karolinska Institutet; 11382 Stockholm Sweden