1. Chemisches und Veterinäruntersuchungsamt (CVUA) Karlsruhe; Weissenburger Strasse 3 76187 Karlsruhe Germany
2. Department of Chemistry; Saratov State University; Astrakhanskaya Street 83 410012 Saratov Russia
3. Bruker Biospin GmbH; Silberstreifen 76287 Rheinstetten Germany