1. Tianjin Key Laboratory on Technologies Enabling Development of Clinical Therapeutics and DiagnosticsSchool of PharmacyTianjin Medical University Tianjin 300070 P. R. China
2. Department of Biological Chemistry and PharmacologyCollege of MedicineThe Ohio State University Columbus OH 43210 USA
3. Center for Biomedical EPR Spectroscopy and ImagingThe Davis Heart and Lung Research Institutethe Division of Cardiovascular MedicineDepartment of Internal MedicineThe Ohio State University Columbus OH 43210 USA
4. Institute of Materials and Environmental ChemistryResearch Centre for Natural SciencesHungarian Academy of Sciences 1117 Budapest Hungary
5. Department of PhysicsBudapest University of Technology and Economics Budafoki ut 8 1111 Budapest Hungary