1. Zentiva, k.s. Praha U Kabelovny 130, Praha 10 Czech Republic
2. Department of analytical chemistryRCPTM, Faculty of SciencePalacký University 17.listopadu 12 Olomouc Czech Republic
3. Department of analytical chemistryCharles UniversityFaculty of Pharmacy Heyrovského 1203 Hradec Králové Czech Republic