scientific article
author: Jose R. Arribas, Federico Pulido, Joaquín Portilla, Juan Pasquau, Matilde Sanchez-Conde, Enrique Bernal, Ana Milinkovic, María L Montes, José López Aldeguer, Piedad Arazo, María Jesús Pérez-Elías, Alberto Arranz, OK04 Study Group, Antonio Ocampo Hermida
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