Author contributions:
TK (corresponding author): was involved in the clinical decision making
and drafted the manuscript.
YA: revised the manuscript critically for important intellectual content
and gave final approval of the version to be published.
YB, YK, and HM: performed epicardial left ventricular lead implantation.
All authors, including KK, MS, KO, YM, MY, and FM read and approved the
final manuscript.