1. Ólvega Primary Care Health Center. Surgery, Ophthalmology, Otorhinolaryngology and Physical Therapy Department, University of Valladolid, Valladolid, Spain
2. Castille and Leon Health Service, Soria, Spain
3. Clinical Research in Health Sciences Group. Department of Surgery, Ophthalmology, Otorhinolaryngology and Physical Therapy, University of Valladolid, Valladolid, Spain