1. Landesbetrieb Landwirtschaft Hessen, Bee institute, Kirchhain, Germany
2. Faculty of Agricultural Sciences and Food, Ss. Cyril and Methodius University in Skopje, Skopje, Macedonia
3. Faculty of Agrobiotechnical Sciences Osijek, J, J. Strossmayer University of Osijek, Osijek, Croatia
4. Agricultural Institute of Slovenia, Ljubljana, Slovenia
5. Instituto Zooprofilattico Sperimentale del Lazio e della Toscana “M. Aleandri”, Rome, Italy
6. Department of Apiculture, Research Institute of Animal Sciences, Hellenic Agricultural Organization “DEMETER”, Nea Moudania, Greece
7. PZ Eko-Pcela, Tome Stefanovski 4-b, Skopje, Macedonia
8. ERBEL, Iberian Bee (Erle Beltz) Breeding Association, Zaldibi-Basque Country, Spain
9. Research Institute of Horticulture, Division of Apiculture, Puławy, Poland
10. Faculty of Agriculture and Life Sciences, University of Maribor, Hoče, Slovenia
11. Edmund Mach Foundation, Center for Technology Transfer, San Michele all'Adige, Italy
12. Faculty of Agriculture, University of Belgrade, Belgrade, Serbia
13. Faculty of Veterinary medicine, University of Ljubljana, Ljubljana, Slovenia
14. ITSAP-Institut de l’abeille, UMT PrADE: Protection des abeilles dans l'environnement INRA, UR 406 A&E - Domaine Saint Paul, AVIGNON CEDEX 9, France
15. Faculty of Animal Bioengineering, Department of Apiculture, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
16. CREA – AA, Bologna, Italy