1. Department of Anthropology and Archaeology; University of Calgary; Calgary Alberta T2N 1N4 Canada
2. Department of Anthropology; University of New Mexico; Albuquerque New Mexico 87131
3. Department of Medical Genetics; University of Calgary; Calgary Alberta T2N 1N4 Canada
4. Alberta Children's Hospital Research Institute; University of Calgary; Calgary Alberta T2N 1N4 Canada