Funding for this research was provided by:
Clinical Epidemiology Research group operational grant (150389)
COVID-19 research grant (CoV19-0301, CoV19-0307)
Collaborative research grant (2001090278)
Prince Abdullah Ben Khalid Celiac Disease Research Chair, under the Vice Deanship of Research Chairs, King Saud University, Riyadh, Kingdom of Saudi Arabia
Received: 25 August 2020
Accepted: 13 April 2021
First Online: 3 May 2021
: All procedures performed in the study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study protocol was evaluated and approved by the University of Sharjah and the United Arab Emirates University ethical review boards. Written consent was obtained prior to individual participation.
: Not applicable.
: The authors declare that they have no competing interests.