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