title: Participation as commodity, participation as gift.
authors.affiliation: Northwestern University Medical School, USA.
authors.forename: T
authors.initials: T
authors.lastname: Chambers
mesh_terms: D000328:Adult; D002986:Clinical Trials as Topic / Q000191:economics; D004467:Economics; D005249:Fees and Charges; D037921:Gift Giving; D006805:Human Experimentation / Q000191:economics; D006801:Humans; D007398:Interpersonal Relations; D035842:Research Subjects; D035844:Researcher-Subject Relations; D012941:Social Responsibility