human 1,804 Humans 1,343 Article 1,158 female 1,073 male 1,038 adult 920 controlled study 871 article 598 Female 523 China 512 Male 483 major clinical study 436 Ecosystems 430 human experiment 363 priority journal 354 COVID-19 347 Adult 346 United States 305 nonhuman 299 middle aged 298 Climate change 292 aged 286 clinical article 280 Forestry 259 child 250 young adult 234 Middle Aged 230 procedures 230 adolescent 219 Sustainable development 212