1. Department of Evolutionary Ecology Leibniz Institute for Zoo and Wildlife Research Berlin Germany
2. Museum of Natural History Berlin Leibniz Institute for Evolutionary and Biodiversity Research Berlin Germany
3. Bernau bei Berlin Germany
4. Leibniz Institute for Animal Biodiversity Section Ornithology Zoological Research Museum Alexander Koenig Bonn Germany
5. Section Ornithology State Museum of Natural History Stuttgart Stuttgart Germany