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Therefore, there is unclear evidence about the preferable cutoff point for determining severe vitamin A deficiency in children in this age group. Blood retinol concentrations have low diagnostic accuracy for severe vitamin A deficiency in children aged 3-10 years. Therefore, there is unclear evidence about the preferable cutoff point for determining severe vitamin A deficiency in children in this age group. Klinefelter syndrome (KS) is a condition at increased risk of thrombosis compared to 46,XY men. This work aimed to investigate the c