1. Institute of Physics, Faculty of Natural Sciences and Mathematics, Ss Cyril and Methodius University in Skopje, Skopje, Macedonia
2. Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss Cyril and Methodius University in Skopje, Skopje, Macedonia
3. Geological Survey of Slovenia, Ljubljana, Slovenia
4. Scientific Tobacco Institute, St. Kliment Ohridski University, Prilep, Macedonia
5. Institute for Public Health of the Republic of Macedonia, Skopje, Macedonia