article human 16 Massachusetts 13 adult 10 female 10 male 9 Humans 7 controlled study 7 Female 5 major clinical study 5 Adult 4 learning 4 Adolescent 3 Male 3 adolescent 3 clinical article 3 perception 3 psychology 3 qualitative research 3 randomized controlled trial 3 Deep neural networks 2 Delivery of Health Care 2 Gradient methods 2 Middle Aged 2 Neural-networks 2 Organizational Culture 2 Pregnancy 2 Sexual Behavior 2 Sexual Partners 2 United States 2