Affiliation: | (1) Saari Unit, Department of Clinical Veterinary Sciences, Faculty of Veterinary Medicine, University of Helsinki, Pohjoinen pikatie 800, FI-04920 Saarentaus, Finland;(2) Laboratory of Organic Chemistry, Department of Chemistry, Faculty of Science, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland;(3) Section of Animal Hygiene, Department of Clinical Veterinary Sciences, Faculty of Veterinary Medicine, University of Helsinki, P.O. Box 57, FIN-00014 Helsinki, Finland |