human Humans 8 adult 5 article 5 decision making 5 Adult 4 Female 4 Male 4 contingent valuation 4 controlled study 4 female 4 male 4 Decision Making 3 major clinical study 3 procedures 3 questionnaire 3 valuation 3 Article 2 Surveys and Questionnaires 2 Valuation 2 Willingness To Pay 2 brain 2 consumer 2 economics 2 human experiment 2 income 2 mortality 2 public health 2 reward 2 social status 2