human 1,137 controlled study 982 Article 897 Humans 829 male 720 female 694 adult 615 TK Electrical engineering. Electronics Nuclear engineering 538 Male 353 Female 348 nonhuman 323 major clinical study 306 article 278 Adult 255 middle aged 235 TJ Mechanical engineering and machinery 229 aged 197 Middle Aged 190 procedures 178 metabolism 165 Animals 164 young adult 158 physiology 155 adolescent 150 animal 150 animal experiment 150 priority journal 149 COVID-19 142 clinical article 141 Young Adult 130