Text and Data Mining valid from 2018-07-02
Received: 6 June 2018
Accepted: 26 June 2018
First Online: 2 July 2018
Compliance with ethical standards
: Ethical clearance and approval were obtained from the National Research Centre Ethics Committee. Approval permission and written consents were obtained from all the participants in the study before collecting the data, and all had the right to withdraw from the study at any time without any explanation.
: The authors declare that they have no conflict of interest.