1 Department of Physiology, University of Kentucky, Lexington, Kentucky. Electronic address: Brian.delisle@uky.edu.
2 Department of Physiology, University of Kentucky, Lexington, Kentucky.
3 University of Florida, Gainesville, Florida.
4 George Washington University, Washington, District of Columbia.
5 Department of Physiology, University of Kentucky, Lexington, Kentucky; Department of Internal Medicine, University of Kentucky, Lexington, Kentucky. Electronic address: eschr0@uky.edu.