title: The problem of representativeness of clinical trial participants: understanding the role of hidden costs.
authors.affiliation: UCSF Medical Center, 505 Parnassus Ave, San Francisco, CA 94143, USA. hala.borno@ucsf.edu.
authors.forename: Hala
authors.initials: H
authors.lastname: Borno
authors.affiliation: Hematologist/Oncologist, Aurora BayCare Medical Center.
authors.forename: Adam
authors.initials: A
authors.lastname: Siegel
authors.affiliation: Professor of Medical Oncology, University of California at San Francisco, CA.
authors.forename: Charles
authors.initials: C
authors.lastname: Ryan
mesh_terms: D002986:Clinical Trials as Topic / Q000191:economics* / Q000331:legislation & jurisprudence; D003365:Costs and Cost Analysis; D006801:Humans; D018579:Patient Selection; D035842:Research Subjects / Q000706:statistics & numerical data*; D014481:United States