Funding for this research was provided by:
US-Egypt Joint Board on Scientific and Technological Cooperation (BIO9-002-010, Contract/Agreement No. 268.)
Text and Data Mining valid from 2019-09-22
Received: 24 May 2019
Accepted: 21 August 2019
First Online: 22 September 2019
Ethics approval and consent to participate
: The work was carried out in accordance with the Helsinki Declaration for experiments involving human beings. The study was approved by the Institutional Review Board of the National Cancer Institute, Cairo University (Approval No 200809003.2 on October 28<sup>th</sup> 2010), and a written informed consent was obtained from all participants or their guardians.
: The authors declare that they have no competing interest.