[1] Univ Florida, Coll Med, Dept Physiol, Gainesville, FL 32610 USA
[2] Univ Florida, Coll Med, Dept Pharmacodynam, Gainesville, FL 32610 USA
[3] Univ Florida, Coll Pharm, Gainesville, FL 32610 USA
[4] Univ Alabama Birmingham, Dept Physiol & Biophys, Birmingham, AL 35298 USA