Study concept and design: All authors.
Acquisition, analysis, or interpretation of data: All authors.
Drafting of the manuscript: McLeod, Matos, Hutfless.
Critical revision of the manuscript for important intellectual content: McLeod, Caturegli, Cooper, Hutfless.
Statistical analysis: McLeod, Matos, Hutfless.
Administrative, technical, or material support: Cooper, Matos.
Study supervision: Cooper, Hutfless.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Cooper reported receiving royalties for serving as an editor to Up-to-Date. No other disclosures were reported.
Funding/Support: A Cancer Council Queensland PhD scholarship helped support Dr McLeod.
Role of the Sponsor: The Cancer Council Queensland 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.
Additional Contributions: We thank Angie Eick-Cost, PhD (Armed Forces Health Surveillance Center), for her assistance in compiling the data for this study; and Monica Vladut-Talor, MSc, and Noel R. Rose, MD, PhD (both with the Department of Pathology, Johns Hopkins University School of Medicine), and Paul W. Ladenson, MD (Division of Endocrinology and Metabolism, Johns Hopkins University School of Medicine), for their contributions to the manuscript. No compensation was received by any of the acknowledged individuals.