Author Contributions: Ms Avant had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Sachs, Avant, Murphy.
Acquisition of data: Sachs, Avant, Lee, Murphy.
Analysis and interpretation of data: Sachs, Avant, Lee, Rodriguez, Murphy.
Drafting of the manuscript: Sachs, Avant, Lee, Murphy.
Critical revision of the manuscript for important intellectual content: Sachs, Avant, Lee, Rodriguez, Murphy.
Statistical analysis: Sachs, Avant, Lee.
Administrative, technical, or material support: Avant, Rodriguez, Murphy.
Study supervision: Murphy.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Additional Contributions: We thank John T. Wilson, MD, Louisiana State University Medical Center for his advice and guidance with this project. He provided information on the methodology used in the 1975 and 1999 reports. He also reviewed and edited the letter. He was not compensated.