1 Department of Pathology, Complejo Asistencial Universitario de León, León, Spain. Electronic address: fizquierdog@saludcastillayleon.es.
2 Department of Traumatology and Orthopedic Surgery, Complejo Asistencial Universitario de León, León, Spain.
3 Department of Pathology, University Hospital Virgen del Rocío, University of Seville, Seville, Spain; Biomedical Institute of Seville (IBIS)-CIBERONIC, Seville, Spain; Department of Normal and Pathological Cytology and Histology, School of Medicine, University of Seville, Seville, Spain.
4 Department of Pathology, University Hospital Vall d'Hebron, Barcelona, Spain.
5 Department of Traumatology and Orthopedic Surgery, University Hospital Doce de Octubre, Madrid, Spain.