1. Department of Natural Resources and Environment, University of Alaska Fairbanks, Fairbanks, AK, USA
2. Reynolds Institute on Aging, University of Arkansas for Medical Sciences, Little Rock, AR, USA
3. Department of Health and Kinesiology, Texas A and M University, College Station, TX, USA
4. Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, AK, USA
5. Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK, USA