1. MEDRAPTORS (Mediterranean Raptor Migration Network), Rome, Italy
2. Centro Ornitologico e di E.A. di Case Vaccà c/o Ente Parco del Beigua, Arenzano, Liguria, Italy
3. Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, The Netherlands
4. Batumi Raptor Count, Chakvi, Adjara, Republic of Georgia
5. DSTA, Department of Earth and Environmental Sciences, University of Pavia, Pavia, Lombardy, Italy