Received: 21 September 2019
Accepted: 15 February 2020
First Online: 26 February 2020
Ethics approval and consent to participate
: Ethical approval for the study was obtained from the Ethics Review Committee of the Health Sciences Center, Kuwait University (approval number VDR/EC/3395). Informed written consent for stool collection was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.