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To compare the DNA fragmentation of semen samples established by terminal deoxynucleotide transferase–mediated dUTP nick-end labeling (TUNEL) after incubation in polyvinylpyrrolidone (PVP) and hyaluronic acid (HA) for different time periods.Comparative prospective study.Center for reproductive medicine.Twenty-seven semen samples from infertile patients.None.Semen analysis and DNA fragmentation assays...