Published Online: March 7, 2013. doi:10.1001/jama.2013.564
Author Contributions: Dr O’Leary 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: O’Leary, Landzberg, Siddiqi, Opotowsky.
Acquisition of data: Opotowsky.
Analysis and interpretation of data: All authors.
Drafting of the manuscript: O’Leary, Opotowsky.
Critical revision of the manuscript for important intellectual content: All authors.
Statistical analysis: O’Leary, Siddiqi, Opotowsky.
Administrative, technical, or material support: Landzberg, Siddiqi, Opotowsky.
Study supervision: Landzberg, Opotowsky.
Conflict of Interest Disclosures: All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Landzberg reported serving as a board member for the Adult Congenital Heart Association, receiving consulting fees from Actelion, and receiving grants from Gilead and the National Heart, Lung, and Blood Institute. Dr Opotowsky reported receiving research support from Actelion, Merck, Boston Children's Office of Faculty Development, Boston Children's Heart Foundation, Children's Heart Foundation of Nevada, and the National Institutes of Health. No other disclosures were reported.