1. Human Cardiovascular Physiology Laboratory; Department of Health and Exercise Science; Center for Cardiovascular Research; Colorado State University; Fort Collins Colorado USA
2. Medical Center of the Rockies Foundation; Poudre Valley Health System; Loveland Colorado USA
3. Department of Kinesiology; Curry School of Education; University of Virginia; Charlottesville Virginia USA
4. Duke Molecular Physiology Institute; Duke University; Durham North Carolina USA