1. Max Planck Research Group on Comparative Population Linguistics, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
2. Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
3. Ghent University, KONGOKING Research Group, Rozier 44, 9000 Ghent, Belgium
4. Université libre de Bruxelles, 50 avenue F. D. Roosevelt, 1050 Brussels, Belgium
5. Royal Museum for Central Africa, Leuvensesteenweg 13, 3080 Tervuren, Belgium