Received: 8 December 2019
Accepted: 31 January 2020
First Online: 13 February 2020
Ethics approval and consent to participate
: The study was approved by the Faculty of Medicine Research Ethical Committee of Fayoum University in its 26th session on 19 June 2016, number D93. A written consent was taken from all the participants either cases or controls after being informed about the objectives of the study, the examination, and the investigations. The confidentiality of their information was respected and their right not to participate in the study was ensured.
: Not applicable
: None of the authors have any competing interests (financial or non-financial)