human 13,406 Humans 10,261 female 7,054 male 6,938 adult 5,820 Article 5,453 controlled study 4,610 Female 4,507 Male 4,293 article 4,079 LB2300 Higher Education 3,471 Adult 2,916 TK Electrical engineering. Electronics Nuclear engineering 2,865 TA Engineering (General). Civil engineering (General) 2,492 major clinical study 2,357 middle aged 2,227 L Education (General) 2,167 TP Chemical technology 2,067 TJ Mechanical engineering and machinery 2,036 procedures 1,929 Middle Aged 1,888 nonhuman 1,883 aged 1,830 young adult 1,760 COVID-19 1,750 adolescent 1,722 human experiment 1,674 Malaysia 1,666 child 1,646 genetics 1,617