Published Online: July 21, 2012. doi:10.1001/jama.2012.9334
Author Contributions: Dr Ackerman 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: Johnson, Ackerman.
Acquisition of data: Johnson.
Analysis and interpretation of data: Johnson, Ackerman.
Drafting of the manuscript: Johnson, Ackerman.
Critical revision of the manuscript for important intellectual content: Johnson, Ackerman.
Statistical analysis: Johnson.
Obtained funding: Ackerman.
Administrative, technical, or material support: Johnson, Ackerman.
Study supervision: Ackerman.
Conflict of Interest Disclosures: Both authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Dr Ackerman is a consultant for Biotronik, Boston Scientific, Medtronic, St Jude Medical, and Transgenomic. Intellectual property derived from Dr Ackerman's research program resulted in license agreements in 2004 between Mayo Clinic Health Solutions (formerly Mayo Medical Ventures) and PGxHealth (formerly Genaissance Pharmaceuticals and now Transgenomic). The Mayo Foundation for Medical Education and Research receives royalties from Transgenomic for the intellectual property used in its FAMILION LQTS genetic test. No other disclosures were reported.
Funding/Support: Dr Ackerman's research program and this study were supported by the Mayo Clinic Windland Smith Rice Comprehensive Sudden Cardiac Death Program.
Role of the Sponsor: The funding source had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; or in the preparation, review, or approval of the manuscript.
Additional Contributions: We thank the patients who sought evaluation at Mayo's LQTS Clinic, as well as Katy Harris, MS, RN (Mayo Clinic); Heidi J. Owen, RN (Mayo Clinic); and Carla M. Haglund (Mayo Clinic) for their assistance with patient follow-up. None of these individuals received compensation.