1. Hellenic Institute of Apiculture—Hellenic Agr. Org. ‘DEMETER’, Nea Moudania, Greece.
2. Consiglio per la sperimentazione e la Ricerca in agricoltura - Unità di ricerca di apicoltura e bachicoltura (CRA-API), Via di Saliceto 80, 40128 Bologna, Italy.
3. LLH, Bee Institute, Erlenstrasse 9, 35274 Kirchhain, Germany.
4. Faculty for Agricultural Science and Food, bul. Aleksandar Makedonski b.b., 1000 Skopje, Republic of Macedonia.
5. Croatian Agricultural Agency, Ilica 101, 10000 Zagreb, Croatia.
6. The University of Applied Sciences Marko Marulic in Knin, Croatia.
7. MTT, Agrifood research Finland, 31600 Jokioinen, Finland.
8. Research Institute of Horticulture, Apiculture Division, 24-100 Puławy, Poland.
9. INRA, UR 406 Abeilles et Environnement, Laboratoire Biologie et Protection de l'abeille, Site Agroparc, 84914 Avignon, France.
10. Apiculture Division, Warmia and Mazury University, Sloneczna 48, 10-710 Olsztyn, Poland.
11. “Bayerische Landesanstalt für Weinbau und Gartenbau, Bee Division, An der Steige 15, 97209 Veitshöchheim, Germany.
12. Agricultural University of Athens, Laboratory of Agricultural Zoology and Entomology, 75 Iera Odos St., Athens 11855 Greece.
13. Bee breeding centre Bantin, Dorfstrasse 50, 19246 Bantin, Germany.
14. University of Århus, DJF, Research Centre Flakkebjerg, 4200 Slagelse, Denmark.
15. Austrian Carnica Association, Sulzbach 1, 3293 Lunz am See, Austria.
16. Agricultural University of Plovdiv, 12, Mendeleev Str, Plovdiv 4000, Bulgaria.
17. Faculty of Agriculture, University of Zagreb, Svetosimunska 25, 10000 Zagreb, Croatia.