Text and Data Mining valid from 2019-07-31
Received: 6 June 2018
Accepted: 24 July 2019
First Online: 31 July 2019
Ethics approval and consent to participate
: The aims of this study, protocols and the informed consent forms were approved by the Institutional Review Board (IRB) at An-Najah National University (IRB archived number: 9th June 2017). This study was carried out according to the requirements of the declarations of Helsinki. Written informed consent for participation in the study was obtained from all informants.
: Not Applicable.
: The authors declare that they have no financial and/or non-financial competing interests.