Text and Data Mining valid from 2019-08-15
Received: 26 June 2019
Accepted: 21 July 2019
First Online: 15 August 2019
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This research was approved by the Research Ethics Committee of the Faculty of Medicine, Cairo University (N-51-2013). Written informed consents were obtained from participants in this study. All authors accepted the publication. The data used or analyzed during the study are available from the corresponding author on reasonable request.
: Not applicable
: The authors declare that they have no competing interests.