1. Charlie Norwood VA Medical Center, One Freedom Way, Augusta, GA, USA.
2. Department of Physiology, Georgia Health Sciences University, Augusta, GA, USA
3. Departments of Medicine (Dermatology), Cell Biology & Anatomy & Orthopaedic Surgery, Georgia Health Sciences University, Augusta, GA, USA
4. Department of Pathology, Georgia Health Sciences University, 1120 15th Street, Augusta, GA 30912, USA