1 Smithsonian Tropical Research Institute, Apartado Postal 0843-03092, Balboa, Ancon, Panama. Electronic address: [email protected].
2 Department of Anthropology, Rutgers University, 131 George Street, Ruth Adams Building Suite 306, New Brunswick, NJ 08901-1414, USA.
3 Institute of Population Genetics, Department of Biomedical Sciences, University of Veterinary Medicine, Veterinärplatz 1, 1210 Vienna, Austria; Austrian Academy of Sciences, Vienna, Austria.