gene frequency article 62 controlled study 46 human 46 Argentina 44 genetic variability 44 Humans 38 nonhuman 38 male 36 genetics 34 genotype 32 Animals 30 Gene Frequency 30 Male 30 priority journal 26 adult 24 female 24 single nucleotide polymorphism 24 Genotype 20 Microsatellite Repeats 20 Polymorphism, Genetic 20 population genetics 20 Female 18 allele 18 genetic polymorphism 18 microsatellite DNA 18 Adult 16 Article 16 Polymorphism, Single Nucleotide 16 major clinical study 16