human 778 Humans 550 female 395 adult 371 male 371 Article 297 article 278 qualitative research 222 controlled study 220 Female 214 Research 199 Male 193 Adult 150 major clinical study 138 middle aged 130 Behavioral research 128 Consumer behavior. Consumers' preferences. Consumer research. Including consumer profiling 122 Education 121 Qualitative Research 118 psychology 117 aged 113 Malaysia 112 human experiment 112 Middle Aged 104 procedures 102 adolescent 97 methodology 95 Study and teaching. Research 93 United States 90 clinical article 89