1. Department of Physiology (V.T., K.K., O.V.), Biocenter Oulu, University of Oulu, FIN-90220 Oulu, Finland
2. Institute of Arctic Medicine (O.A.), Biocenter Oulu, University of Oulu, FIN-90220 Oulu, Finland
3. Pharmacology and Toxicology (H.R.), Biocenter Oulu, University of Oulu, FIN-90220 Oulu, Finland