1. Faculty of Agricultural Sciences and Food, bul. Aleksandar Makedonski b. b., 1000 Skopje, Republic of Macedonia.
2. 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.
3. Research Institute of Horticulture, Apiculture Division, 24-100 Puławy, Poland.
4. LLH, Bee Institute, Erlenstrasse 9, 35274 Kirchhain, Germany.
5. University of Århus, DJF, Research Centre Flakkebjerg, 4200 Slagelse, Denmark.
6. Hellenic Institute of Apiculture—Hellenic Agr. Org. ‘DEMETER’, Nea Moudania, Greece.
7. Agricultural University of Athens, Laboratory of Agricultural Zoology and Entomology, 75 IeraOdos St., Athens 11855 Greece.
8. INRA, UR 406 Abeilles et Environnement, Laboratoire Biologie et Protection de l'abeille, Site Agroparc, 84914 Avignon, France.
9. Apiculture Division, Warmia and Mazury University, Sloneczna 48, 10-710 Olsztyn, Poland.
10. Marko Marulic Polytechnics of Knin, Kresimirova 30, HR22300 Knin, Croatia.
11. Agricultural University of Plovdiv, 12, Mendeleev Str., Plovdiv 4000, Bulgaria.
12. MTT Agrifood Research Finland, 31600 Jokioinen, Finland.
13. Austrian Carnica Association, Sulzbach 1, 3293 Lunz am See, Austria.
14. Bayerische Landesanstalt für Weinbau und Gartenbau, Bee Division, An der Steige 15, 97209 Veitshöchheim, Germany.
15. Bee breeding centre Bantin, Dorfstrasse 50, 19246 Bantin, Germany.
16. University of Plovdiv „Paisii Hilendarski”, Department of Developmental Biology, Section of Genetics, 24, Tsar Asen Str., Plovdiv 4000, Bulgaria.