1. Department of Epidemiology, Dartmouth College, Lebanon, NH
2. Department of Biology, Dartmouth College, Hanover, NH
3. Center for Alaska Native Health Research, Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK
4. Department of Genetics, Dartmouth College, Lebanon, NH
5. Institute for Quantitative Biomedical Sciences, Geisel School of Medicine, Dartmouth College, Lebanon, NH