female 7,057 human 6,817 male 6,077 Humans 5,265 adult 4,812 Female 4,508 Male 3,820 Article 3,064 controlled study 2,885 Adult 2,500 major clinical study 2,125 middle aged 2,042 Middle Aged 1,754 article 1,754 aged 1,605 young adult 1,572 adolescent 1,458 Young Adult 1,423 Adolescent 1,270 child 1,245 human experiment 1,191 clinical article 1,100 Aged 1,087 physiology 978 procedures 928 psychology 925 Child 917 questionnaire 735 diagnostic imaging 733 cross-sectional study 713