1. Erasmus MC, Department of Viroscience, Rotterdam, the Netherlands
2. Netherlands Institute of Ecology [NIOO-KNAW], Department of Animal Ecology, Wageningen, the Netherlands
3. Vogeltrekstation - Dutch Centre for Avian Migration and Demography [NIOO-KNAW], Wageningen, the Netherlands
4. Sovon, Dutch Centre for Field Ornithology, Nijmegen, the Netherlands
5. Bird Ringing Centre of Russia, Moscow, Russia