Stanislav Kochev, Stanislava Stoicheva, Valentina Belcheva, Evgeni Grigorov Faculty of Pharmacy, Medical University “Prof. d-r Paraskev Stoyanov”, Varna
Silvia Simeonova, Christo Tsachev, Nikola Hristov, Marin Simeonov, Veselin Petrov Faculty of Chemistry and Pharmacy, University of Sofia ‘‘St. Kliment Ohridski”