human 298 Humans 245 female 219 controlled study 212 male 206 randomized controlled trial 181 adult 168 Female 156 Male 146 Article 124 double blind procedure 118 Adult 97 Double-Blind Method 83 middle aged 82 Middle Aged 73 major clinical study 68 treatment outcome 66 aged 65 Treatment Outcome 57 procedures 56 adolescent 54 Adolescent 51 clinical article 50 Young Adult 48 young adult 48 clinical trial 47 Aged 45 child 39 single blind procedure 39 placebo 38