Financial Disclosures: None reported.
Author Contributions: Dr Kuschyk 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: Kuschyk, Borggrefe, Wolpert.
Acquisition of data: Kuschyk, Brade, Borggrefe, Haghi.
Analysis and interpretation of data: Kuschyk, Brade, Borggrefe, Wolpert, Haghi.
Drafting of the manuscript: Kuschyk, Borggrefe, Wolpert.
Critical revision of the manuscript for important intellectual content: Brade, Borggrefe, Wolpert, Haghi.
Statistical Analysis: Kuschyk, Brade, Wolpert.
Study supervision: Kuschyk, Borggrefe, Wolpert, Haghi.
Funding/Support: The Holter electrocardiogram recorder was provided from Mortara Instuments Inc, Milwaukee, Wisconsin.
Role of the Sponsor: Mortara Instuments Inc did not participate in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, or approval of the manuscript.
Additional Contributions: We thank Mr Wolfgang Schneider, director, Holiday Park, Hassloch, Germany, and his staff for the opportunity to perform this study. We thank Axel Kobudzinski for the preparation of the recorded Holter electrocardiographs. Neither Mr. Kobudzinski nor Mr. Schneider received compensation for their role in the study.