Received: 22 July 2020
Accepted: 13 January 2021
First Online: 19 January 2021
Ethics approval and consent to participate
: The ethical board of Ziauddin Hospital, Karachi, Pakistan has approved this cohort study with reference to our previous study (Ref # 28/02/KK/ZHC). All participants gave their written informed consent to participate in this study.
: Not applicable.
: The authors declare that they have no competing interests.