Received: 28 April 2019
Accepted: 19 August 2019
First Online: 5 September 2019
Ethics approval and consent to participate
: The study was approved by the Faculty of Medicine Research Ethical Committee of Fayoum University in its 33<sup>rd</sup> session on the 11<sup>th</sup> of January 2017, number M201. 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.
: A consent for publication was obtained from all the participants included in the study. The manuscript does not contain any individual person’s data.
: The authors declare that they have no competing interests.