Text and Data Mining valid from 2018-09-03
Received: 14 June 2018
Accepted: 25 June 2018
First Online: 3 September 2018
Ethics approval and consent to participate
: The study protocol was approved by the Ethical Committee Board of the National Research Centre, Cairo, Egypt, with registration number 17006. An informed written consent was obtained from all participants.
: Not applicable
: The authors declare that they have no competing interests.
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