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Human
Male
human
male
79
article
75
Female
73
Support, Non-U.S. Gov't
71
priority journal
56
Adult
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female
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Middle Age
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adult
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Aged
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controlled study
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human cell
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Adolescent
29
Child
27
major clinical study
24
Animal
22
Child, Preschool
21
aged
20
adolescent
19
Spermatozoa
18
clinical article
18
child
17
Time Factors
16
case report
16
Case Report
12
Comparative Study
12
Rats
12
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