Published Online: February 16, 2015. doi:10.1001/jamainternmed.2014.8020.
Study concept and design: Goffredo, Dinan, Roman, Sosa.
Acquisition, analysis, or interpretation of data: Goffredo, Thomas, Dinan, Perkins.
Drafting of the manuscript: Goffredo, Dinan, Perkins, Roman.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: Goffredo, Thomas, Dinan, Roman.
Obtained funding: Goffredo.
Administrative, technical, or material support: Dinan, Roman, Sosa.
Study supervision: Perkins, Roman, Sosa.
Conflict of Interest Disclosures: None reported.
Funding/Support: Dr Goffredo is supported by the Fondazione Italiana per la Ricerca sul Cancro (Italian Foundation for Cancer Research).
Role of the Funder/Sponsor: The funding source had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Disclaimer: Some of the data used in the study are derived from a deidentified National Cancer Data Base file. The American College of Surgeons and the Commission on Cancer have not verified and are not responsible for the analytic or statistical methods used, or the conclusions drawn from these data by the investigators.
Additional Contributions: Mohamed Abdelgadir Adam, MD, Section of Endocrine Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina, and Linda Youngwirth, MD, Duke Clinical Research Institute, and Section of Endocrine Surgery, Department of Surgery, Duke University Medical Center, Durham, North Carolina, assisted with data acquisition and statistical work. They were not compensated for their contributions.