ECG: electrocardiogram; EST: ergometric stress test; PVCs: premature ventricular contractions.
Declarations
Acknowledgments
All authors acknowledge the nursing, laboratory, and rehabilitation staff taking care of the participants described.
Author contributions
TM: Conceptualization, Writing—original draft. YY: Data curation, Formal analysis, Investigation. MH: Data curation, Formal analysis, Writing—review & editing, Supervision. All authors read and approved the submitted version.
Conflicts of interest
The authors declare that they have no conflicts of interest.
Ethical approval
This study complied with the Declaration of Helsinki. Ethical approval for this study was waived by the Internal Ethics Committee under the condition of secure personal data protection and compliance with privacy policy, because the examinations and treatment of two cases were followed strictly by the Regulation of Japanese Healthcare Insurance.
Consent to participate
Informed consent to participate in this study was obtained from participants and guardians.
Consent to publication
Informed consent to publication was obtained from participants and guardians.
Availability of data and materials
The datasets of this manuscript could be available from the corresponding authors upon reasonable request to Toru Maruyama (tmaruyama@haradoi-hospital.com).
Open Exploration maintains a neutral stance on jurisdictional claims in published institutional affiliations and maps. All opinions expressed in this article are the personal views of the author(s) and do not represent the stance of the editorial team or the publisher.
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