1. LLH, Bee Institute, Erlenstrasse 9, 35274 Kirchhain, Germany.
2. Department of Agroecology, University of Århus, Flakkebjerg, 4200 Slagelse, Denmark.
3. Warsaw University of Life Sciences, Faculty of Veterinary Medicine, Department of Pathology and Veterinary Diagnostics, Laboratory of Bee Diseases, Ciszewskiego 8 Street, 02-787 Warsaw, Poland.
4. Faculty of Agricultural Sciences and Food, bul. Aleksandar Makedonski b. b., 1000 Skopje, Republic of Macedonia.
5. Consiglio per la Ricerca e la sperimentazione in Agricoltura—Unità di ricerca di apicoltura e bachicoltura (CRA-API), Via di Saliceto 80, 40128 Bologna, Italy.
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. Landesverband der Imker Mecklenburg und Vorpommern e.V., Bee Breeding Centre Bantin, Wittenburger Straβe 3, 19246 Bantin, Germany.
10. National Diagnostic Research Veterinary Medical Institute, Sofia, Bulgaria.
11. Hellenic Institute of Apiculture—Hellenic Agr. Org. ‘DEMETER’, N. Moudania 63200, Greece.
12. University of Plovdiv, “Paisii Hilendarski”, Department of Developmental Biology, Section of Genetics, 24 Tsar Asens St, Plovdiv 4000, Bulgaria.
13. Faculty of Agriculture, University of Zagreb, Svetosimunska 25, 10000 Zagreb, Croatia.
14. MTT, Agrifood research Finland, 31600 Jokioinen, Finland.
15. INRA, UR 406 Abeilles et Environnement, Laboratoire Biologie et Protection de l'abeille, Site Agroparc, 84914 Avignon, France.
16. Austrian Carnica Association, Sulzbach 1, 3293 Lunz am See, Austria.
17. Laboratory of Conservation and Evaluation of Native and Floricultural Species—Hellenic Agr. Org. ‘DEMETER’, PO Box 60125, 57 001 Thermi-Thessaloniki, Greece.
18. Apiculture Division, Warmia and Mazury University, Sloneczna 48, 10-710 Olsztyn, Poland.