human Humans 231 Article 196 female 195 adult 191 male 183 controlled study 173 major clinical study 124 blood sampling 109 Female 99 Male 92 article 88 sample size 80 Adult 77 middle aged 74 Middle Aged 61 procedures 55 aged 54 human experiment 52 blood 46 young adult 43 adolescent 40 clinical article 40 questionnaire 40 Young Adult 38 human tissue 37 genetics 36 Adolescent 33 cross-sectional study 32 sampling 32