1. Department of Dermatology; Saint-Louis Hospital; Paris France
2. Université Paris Diderot-Paris VII; Sorbonne Paris Cité; Paris France
3. King Abdulaziz University; Jeddah Saudia Arabia
4. Department of Internal Medicine; Hospital Louis Pasteur; Chartres France
5. Department of Biological Immunology; Saint-Louis Hospital; Paris France
6. Department of Pathology; Saint-Louis Hospital; Paris France
7. Department of Clinical Immunology; Saint-Louis Hospital; Paris France
8. Groupe d'Etude des Dermatoses associées à une Immunoglobuline Monoclonale; Paris France