1. Departments of Dermatology, Pediatrics, and Pathology and Laboratory Medicine, Hospital of the University of Pennsylvania; Children's Hospital of Philadelphia; Perelman School of Medicine at the University of Pennsylvania; Philadelphia PA USA
2. Department of Dermatology; Emory University School of Medicine; Atlanta GA USA
3. Hon. Pr. of the University of Franche-Comté; Nail Disease Centre; Cannes France