1. Department of Dermatology and Referral Center for Auto-Immune Bullous Diseases; Avicenne Hospital; APHP; University Paris 13 93009 Bobigny France
2. Department of Gastroenterology; Avicenne Hospital; APHP; University Paris 13 93009 Bobigny France
3. Department of Histology and Referral Center for Auto-Immune Bullous Diseases; UFR Léonard de Vinci; University Paris 13 93017 Bobigny France
4. Department of Pathology; Avicenne Hospital; APHP; University Paris 13 93009 Bobigny France