“…The initial reports on lower counts of ovulation-competent eggs in blood group O females (Nejat et al, 2011) have not been confirmed (Spitzer et al, 2014), and the pronounced ovarian hyperstimulation in females with blood group A (Binder et al, 2008) could not be documented in subsequent studies (Pereira et al, 2015). Similarly, the prevalence of male infertility in blood group O males (Khan et al, 2010) was not confirmed in a more recent study (Prasad et al, 2015). These conflicting results may reflect the confounding effect of hidden ethnic diversity in the analysis of genetic statistics from any given contemporary population, in addition to issues with non-comparable experimental designs and techniques.…”