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Vallejo M, Jáuregui-Renaud K, Hermosillo AG, Márquez MF, Cárdenas M.Vallejo M, et al. Among authors: marquez mf.Gac Med Mex. 2003 Jan-Feb;139(1):57-63.Gac Med Mex. 2003.PMID: 12666410Review.Spanish.