human 77 male 61 Humans 60 female 60 visual analog scale 60 Article 55 controlled study 54 adult 49 Female 42 Male 42 Adult 31 Media studies 22 young adult 22 randomized controlled trial 21 clinical article 20 Young Adult 19 major clinical study 19 analogs and derivatives 18 middle aged 16 aged 15 procedures 15 Research & information: general 14 treatment outcome 14 History of engineering and technology 13 Middle Aged 13 priority journal 13 adolescent 12 comparative study 12 drug effect 12 Adolescent 11