1. Department of Microbiology, Biochemistry and Immunology, Morehouse School of Medicine, Atlanta, GA 30310, USA
2. Department of Biomedical Sciences, School of Medicine Greenville, University of South Carolina, Greenville, SC 29605, USA
3. Department of Chemistry, Xavier University, New Orleans, LA 70125, USA
4. Department of Neurosurgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China