1. Department of General Microbiology, The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, Sofia, Bulgaria
2. Department of Chemical and Biochemical Reactors, Institute of Chemical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
3. Department of Medical Chemistry and Biochemistry, Faculty of Medicine, Medical University of Sofia, Sofia, Bulgaria
4. State Key Laboratory of Dairy Biotechnology, Dairy Research Institute, Bright Dairy & Food Co., Ltd, Shanghai, PR China