1. Vascular Physiology Research Group, Department of Biomedical Sciences, Colorado State University, Fort Collins, CO 80523, USA.
2. Department of Pharmacology, University of Vermont, Burlington, VT 05405, USA.
3. Institute of Cardiovascular Sciences, University of Manchester, Manchester M13 9NT, UK.
4. Department of Pharmacology, University of Nevada School of Medicine, Reno, NV 89557–0318, USA.