1. Diagnostic laboratory ‘Ramus‘, Naroden front 14, 1000 Skopje, R. N. Macedonia
2. Institute of Pharmacognosy, Faculty of Pharmacy, Ss. Cyril and Methodius University in Skopje, Mother Theresa 47, 1000 Skopje, R. N. Macedonia
3. Research Center for Environment and Materials, Macedonian Academy of Sciences and Arts, Krste Misirkov 2, 1000 Skopje, R. N. Macedonia
4. Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University in Skopje, Arhimedova 5, POB 162, 1000 Skopje, R. N. Macedonia