human 1,068 Humans 819 female 587 male 557 adult 496 Article 481 Female 363 controlled study 359 Male 333 article 296 TP Chemical technology 246 Adult 245 major clinical study 226 middle aged 201 aged 190 TA Engineering (General). Civil engineering (General) 188 COVID-19 161 Middle Aged 158 adolescent 157 procedures 143 Adolescent 142 young adult 142 nonhuman 134 TJ Mechanical engineering and machinery 130 clinical article 122 Aged 121 Young Adult 121 child 121 human experiment 121 TK Electrical engineering. Electronics Nuclear engineering 120