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Ramírez-Fernández M, Calvo-Guirado JL, Delgado-Ruiz RA, Maté-Sánchez Del Val JE, Vicente-Ortega V, Meseguer-Olmos L.Ramírez-Fernández M, et al.Clin Oral Implants Res. 2011 Jul;22(7):767-773. doi: 10.1111/j.1600-0501.2010.02058.x. Epub 2011 Jan 18.Clin Oral Implants Res. 2011.PMID: 21244497Retracted.