Author Contributions: Dr Sommers 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: Sommers, Kronick.
Acquisition of data: Sommers.
Analysis and interpretation of data: Sommers, Kronick.
Drafting of the manuscript: Sommers.
Critical revision of the manuscript for important intellectual content: Sommers, Kronick.
Statistical analysis: Sommers.
Administrative, technical or material support: Kronick.
Study supervision: Kronick.
Conflict of Interest Disclosures: The authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.