1. Department of Dermatology; Hospital Clínico Universitario de Valladolid; Valladolid Spain
2. Department of Pediatrics - Section of Gastroenterology; Hospital Clínico Universitario de Valladolid; Valladolid Spain
3. Department of Microbiology; Hospital Clínico Universitario de Valladolid; Valladolid Spain