human 117 genetics 100 Humans 98 Article 88 controlled study 69 Malaysia 65 male 64 nonhuman 62 female 56 Female 48 Male 48 adult 47 metabolism 42 Animals 37 priority journal 37 article 36 animal 33 Adult 28 genotype 28 middle aged 27 polymerase chain reaction 27 Middle Aged 26 genetic variability 25 major clinical study 25 unclassified drug 23 chemistry 21 aged 20 nucleotide sequence 19 gene expression 18 genetic association 18