1. Institute of Vertebrate Biology; Academy of Sciences of the Czech Republic; Květná 8 CZ-60365 Brno Czech Republic
2. Department of Bird Migration; Swiss Ornithological Institute; Seerose 1 CH-6204 Sempach Switzerland
3. MNHN; Centre d'Ecologie et de Sciences de la Conservation; 55 rue Buffon CP51 75005 Paris France
4. Dutch Centre for Avian Migration and Demography NIOO-KNAW; Postbus 50 NL-6700 AB Wageningen The Netherlands
5. Department of Anatomy, Cell- and Developmental Biology; Eötvös Loránd University; Pázmány Péter sétány 1/c H-1117 Budapest Hungary
6. Museum and Institute of Zoology; Ornithological Station; Polish Academy of Sciences; Nadwiślańska 108 80-680 Gdańsk Poland
7. Royal Belgian Institute of Natural Sciences; Brussels Belgium