Article History
Received: 20 November 2019
Accepted: 17 July 2020
First Online: 27 August 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of High Institute of Public Health, Alexandria University, Egypt in May 24, 2016. After explaining the aim of the study, verbal informed consent was obtained from all participants and their anonymity and confidentiality were guaranteed. Written consent was not needed as the research did not involve giving any investigational medicines or taking any biological samples. For illiterate participants, verbal informed consent was obtained from participants and their accompanying legally authorized representatives.
: Not applicable. The manuscript does not include any individual person’s data in any form (including individual details, images or videos).
: The authors report no conflicts of interest in this work.