00454nam a22001817i 450000500170000000800410001704100080005810000180006624500190008465000110010365000290011465000130014365000120015665000100016865000200017865500150019877300590021320141212085850.0870624s1987    sp     gr     000 0 spa c  aeng1 aD'ALTON, M.E.10aTWIN PREGNANCY14aAborto14aAnomalías congénitas14aEmbarazo14aGemelos14aParto14aPerinatología 4aDocumental0 tSEMINARS IN PERINATOLOGYgVol. 10, no. 1 (1986), p. 92