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Correspondence to: E Frank ; Email: efrank@emory.edu
EF was responsible for the conception, design, and interpretation of data, for drafting the article and revising it, and providing final approval of the version to be published. She is guarantor.
LE contributed to study design, was responsible for data analysis and interpretation, contributed to article revision for important intellectual content, and approved the final version.
TN contributed to study design, analysis and interpretation of data, drafting components of the article, critical revisions, and approved the final version. RB contributed to study design, analysis and interpretation of data, drafting components of the article, critical revisions, and approved the final version.
Ethical approval: This work was approved by the institutional review board at Emory University, and informed consent was given by all participants.
Provenance and peer review: Not commissioned; externally peer reviewed.
Competing interests: None declared.
This work was supported by the American Cancer Society, Annenberg Physician Training Program, Canada Research Chair Program, and the Michael Smith Foundation for Health Research.
© Frank et al 2008