1. Center for Population Health Research, University of Montana, Missoula, Montana, USA
2. School of Public and Community Health Sciences, University of Montana, Missoula, Montana, USA
3. Center for Alaska Native Health Research, University of Alaska Fairbanks, Alaska, USA
4. Oregon Health & Science University, Portland, Oregon, USA
5. Community Environmental Health Program, College of Pharmacy, University of New Mexico Health Sciences Center, University of New Mexico, Albuquerque, New Mexico, USA