[1] Johns Hopkins Med Inst, Dept Med, Div Cardiol, Mol & Cellular Biophys Labs, Baltimore, MD 21205 USA
[2] Johns Hopkins Med Inst, Electron Paramagnet Resonance Ctr, Baltimore, MD 21205 USA
[3] Univ Sao Paulo, Dept Emergency Med, BR-05508 Sao Paulo, Brazil
[4] Ohio State Univ, Davis Heart & Lung Res Inst, Columbus, OH 43210 USA