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Venous blood samples were drawn from all 60 children into sterile polypropylene tubes containing K2 EDTA (Sarstedt, Nümbrecht, Germany) using standardized procedures the same month of the year from 8:00 to 10:00 a.m. in respect of the circadian [48,49] and infradian [50,51] rhythm of testosterone fluctuations from all children at the Pediatric Department of Children Faculty Hospital CU in Bratislava.
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