1. Bristol Dermatology Centre; Bristol Royal Infirmary; Bristol UK
2. Dermatology, Department of Experimental, Diagnostic and Specialty Medicine; University of Bologna; Bologna Italy
3. Dermatology/Dermatopathology; University of California; San Francisco
4. Dermatopathology; Palo Alto Medical Foundation; Palo Alto CA USA
5. Hon. Pr. of the University of Franche-Comté; Nail Disease Centre; Cannes France