1. Department of Organic Chemistry, University of Debrecen, P.O. Box 400, H-4002 Debrecen, Hungary
2. Department of Biochemistry and Biotechnology, University of Thessaly, Biopolis, 41500 Larissa, Greece
3. Department of Biochemistry, Veterinary School, University of Thessaly, 224 Trikalon, 43131 Karditsa, Greece
4. Department of Laboratory Medicine, Lund University, SE-2210 Lund, Sweden
5. Department of Chemistry, Lund University, SE-2210 Lund, Sweden