Retraction: Efficacy of intensive radiofrequency energy delivery to the localized dense scar area in post-infarction ventricular tachycardia ablation: A comparative study with standard strategy targeting the infarcted border zone (Circulation Journal (2017) 81:11 (1603-1610) DOI: 10.1253/circj.CJ-17-0306)

Dear Editor in Chief, Circulation Journal We'd like to retract our manuscript published in your journal (Kuroki K, Nogami A, Yoshida K, Goya M, Fukunaga M, Kaitani K, Onishi N, Mine T, Koyama T, Igawa M, Machino T, Yamasaki H, Xu D, Igarashi M, Murakoshi N, Sekiguchi Y, Aonuma K. Efficacy of Intensive Radiofrequency Energy Delivery to the Localized Dense Scar Area in Post-Infarction Ventricular Tachycardia Ablation: A Comparative Study With Standard Strategy Targeting the Infarcted Border Zone. Circ J 2017; 81(11): 1603 - 1610). We apologize that we have not obtained the approval of Institutional Review Board for this study. This request of retraction was agreed by all authors of this paper. We are deeply sorry for any inconvenience this has caused.