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Level of 25(OH)D concentration in blood plasma in analysed young soccer players at the beginning and the end of the autumn in TOTAL, LDG, HDG, ODG and SDG. * significantly different from PRE at p < 0.001. TG-total group; SDG—suboptimal 25(OH)D concentration group; ODG—optimal 25(OH)D concentration group; HDG—high drop group; LDG—low drop group.
