Received: 22 November 2019
Accepted: 12 January 2020
First Online: 21 January 2020
Ethics approval and consent to participate
: This research involved human subjects and was performed in accordance with the Declaration of Helsinki and approved by Cairo University Cardiology Department Ethical Committee. The Committee did not provide a reference number in 2005 (at the time of the beginning of the registry). A written informed consent was obtained from all patients.
: Not applicable
: The authors declare that they have no competing interests.