The combination of maternal KIR haplotype and parental, donors HLA-C, could predict which couple can benefit for the selection of SET/DET, or donor selection by HLA-C in ART, in order to increase the LBR/cycle since HLA-C1/C1 donors are predicted to be safer and C2/C2 males or oocyte donors may be mor "dangerous" as identified by epidemiological studies