human 1,382 Humans 1,264 male 929 female 889 Male 759 Female 739 adult 674 Article 517 Adult 471 middle aged 423 Middle Aged 396 controlled study 394 aged 339 Aged 281 procedures 269 adolescent 248 major clinical study 235 Adolescent 233 child 231 young adult 212 Child 201 Young Adult 195 pathology 192 cross-sectional study 180 retrospective study 174 questionnaire 169 clinical article 167 priority journal 166 Cross-Sectional Studies 165 metabolism 160