Received: 20 September 2018
Accepted: 3 January 2019
First Online: 1 April 2019
Ethics approval and consent to participate
: The Aga Khan University Ethical Review Committee gave the ethical approval for the study (1994-Med-ERC-11). Every patient gave a written, informed consent before participating in the study.
: Not Applicable.
: The authors declare that they have no competing interests.
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