1. Department of Medicine, University of North Carolina School of Medicine, Chapel Hill, NC, USA
2. Department of Dermatology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
3. Dermatopathology Laboratory, Department of Dermatology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
4. Department of Medicine, Division of Hematology, University of North Carolina School of Medicine, Chapel Hill, NC, USA