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[Twin pregnancy discordant for trisomy 13: three cases].
López-Velasco N, Sotillo-Mallo L, Martínez-Montoro B, Fernández-Miranda Mde L. López-Velasco N, et al. Among authors: sotillo mallo l. Ginecol Obstet Mex. 2013 Mar;81(3):158-62. Ginecol Obstet Mex. 2013. PMID: 23672117 Spanish.