1. Department of Dermatology Hospital Universitario La Paz Madrid Spain
2. Facultad de Medicina Universidad Autónoma de Madrid (UAM) Madrid Spain
3. Department of Surgery, Section of Coloproctology Hospital Universitario La Paz Madrid Spain
4. Department of Internal Medicine Hospital Universitario La Paz Madrid Spain
5. IdiPAZ Instituto de Investigación Hospital Universitario La Paz Madrid Spain
6. Department of Pathology Hospital Universitario La Paz Madrid Spain