1 Department of Internal Medicine, Division of Dermatology and Dermatologic Surgery, Dell Medical School at the University of Texas at Austin, Austin, Texas, USA.
2 Department of Medical Education, Dell Medical School at the University of Texas at Austin, Austin, Texas, USA.
3 Departments of Dermatology, Genetics, and Pathology, Yale University School of Medicine, New Haven, Connecticut, USA.
4 Department of Pediatrics, Dell Children's Medical Center, Austin, Texas, USA.