[1] Univ Paris 13, Avicenne Hosp, APHP, Dept Dermatol, F-93009 Bobigny, France
[2] Univ Paris 13, Avicenne Hosp, APHP, Referral Ctr Autoimmune Bullous Dis, F-93009 Bobigny, France
[3] Univ Paris 13, Avicenne Hosp, APHP, Dept Gastroenterol, F-93009 Bobigny, France
[4] Univ Paris 13, Avicenne Hosp, APHP, Dept Pathol, F-93009 Bobigny, France
[5] Univ Paris 13, Dept Histol, F-93017 Bobigny, France
[6] Univ Paris 13, Referral Ctr Autoimmune Bullous Dis, UFR Leonard Vinci, F-93017 Bobigny, France