1. LLH, Bee Institute, Kirchhain, Germany
2. Ss. Cyril and Methodius University in Skopje, Faculty for Agricultural Science and Food, Skopje, Republic of Macedonia
3. Swedish University of Agricultural Sciences, Uppsala, Sweden
4. Institute for Bee Research Hohen Neuendorf, Hohen Neuendorf, Germany
5. CREA Research Centre for Agriculture and Environment, Bologna, Italy
6. Behavioral Physiology and Sociobiology, Biocenter, Julius-Maximilians-Universität Würzburg, Würzburg, Germany
7. Department of Entomology, Purdue University, West Lafayette, IN, USA
8. Department of Apiculture, Inst. of Animal Science, ELGO ‘DIMITRA’, Nea Moudania, Greece
9. Faculty of Agriculture, University of Zagreb, Zagreb, Croatia
10. Faculty of Agrobiotechnical Sciences Osijek, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
11. Department of Agroecology, Aarhus University, 4200 Slagelse, Denmark
12. INRAE, Avignon, France
13. Department of Entomology, University of Minnesota, St. Paul, MN, USA
14. Apiculture Division, Faculty of Animal Bioengineering, Warmia and Mazury University, Olsztyn, Poland