1. The Henry D. Janowitz Division of Gastroenterology; The Leona M. Harry B. Helmsley Inflammatory Bowel Disease Center; Icahn School of Medicine at Mount Sinai; New York NY USA
2. Department of Stomatology; Centre Hospitalier Régional Universitaire de Lille 2; Lille Cedex France
3. Department of Dermatology; Centre Hospitalier Régional Universitaire de Lille 2; Lille Cedex France