Received: 1 November 2019
Accepted: 7 May 2020
First Online: 24 May 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee of the Institutional Review Board (IRB) for medical research ethics, Faculty of Medicine, Zagazig University. A detailed informed verbal consent has been taken from all participants as it was just observational study with no intervention and they have to undergo CTO PCI anyway with our follow up that was of a great value for them and this consent was approved by the ethics committee. Ethics committee’s reference number: ZU-IRB#3943.
: Available in the same consent.
: None of the authors have any relationships with companies or other financial conflicts of interest associated with the work in the manuscript.