1. Department of Agrobiotechnology, AgroBioInstitute, Agricultural Academy, Sofia, Bulgaria
2. Institute of Applied Biosciences, Centre for Research & Technology, Hellas, Thessaloniki, Greece
3. Department of Agricultural Sciences, Biotechnology and Food Science, Faculty of Geotechnical Sciences and Environmental Management, Cyprus University of Technology, Limassol, Cyprus
4. Professional High School of Forestry, Velingrad, Bulgaria