1. University of Food Technologies, Department of Nutrition and Tourism, Plovdiv, Bulgaria
2. Lotos Expert OOD, Plovdiv, Bulgaria
3. Angel Kanchev University of Russe, Razgrad Branch, Department of Biotechnology and Food Technology, Razgrad, Bulgaria
4. Paisii Hilendarski University of Plovdiv, Faculty of Biology, Plovdiv, Bulgaria
5. Ataturk University, Faculty of Agriculture, Horticulture Department, Erzurum, Turkey
6. University of Food Technologies, Department of Tobacco, Sugar, Vegetable and Essential Oils, Plovdiv, Bulgaria