1. Institute for Medical Research and Occupational Health, Analytical Toxicology and Mineral Metabolism Unit; Ksaverska cesta 2 10 000 Zagreb Croatia
2. University of Zagreb, Faculty of Pharmacy and Biochemistry; Department for Clinical Chemistry; Ante Kovačića 1 10 000 Zagreb Croatia
3. Ruđer Bošković Institute; Division of Physical Chemistry; Bijenička cesta 54 10 000 Zagreb Croatia
4. University of Zagreb, School of Medicine; Department for Hystology and Embryology; Šalata 3 10 000 Zagreb Croatia
5. Institute for Chemistry, Analytical Chemistry, Karl-Franzens University, Universitätsplatz 1; 8010 Graz Austria