1. Department of Pathology; Hôpital Saint-Antoine; Hôpitaux Universitaires Paris Est, AP-HP; Paris France
2. Université Pierre et Marie Curie - Paris 6; Paris France
3. Department of Virology; Hôpital Européen Georges Pompidou; Hôpitaux Universitaires Paris Ouest, AP-HP; Paris France
4. Department of Proctology; Groupe Hospitalier Diaconesses Croix Saint-Simon; Paris France