[1] Univ Complutense Madrid, Dept Paleobiol, Fac Ciencias Geol, E-28040 Madrid, Spain
[2] Univ Complutense Madrid, Inst Geol Econ, CSIC, Unidad Asociada Paleoantropol, E-28040 Madrid, Spain
[3] Univ Madrid, Dept Radiol & Med Fis, Hosp 12 Octubre, Carretera Andalucia, Madrid, Spain
[4] Univ Complutense Madrid, Fac Ciencias Fis, Dept Tecnol Comp & Automat, E-28040 Madrid, Spain
[5] Univ Complutense Madrid, Fac Ciencias Fis, Dept Astrofis, E-28040 Madrid, Spain