1. Department of Chemistry and Biochemistry; Faculty of Veterinary Medicine; Zagreb Croatia
2. Clinic for Internal Diseases; Faculty of Veterinary Medicine; Zagreb Croatia
3. Department of Laboratory Diagnostics; Clinical Hospital “Sestre Milosrdnice”; Zagreb Croatia
4. Department of Laboratory Diagnostics; Clinic for Pulmonary Diseases “Jordanovac”; Zagreb Croatia
5. Unit for Special Laboratory Diagnostics; University Children's Hospital, Medical Centre Ljubljana; Ljubljana Slovenia