Received: 19 September 2019
Accepted: 11 May 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: The study was conducted in accordance with the regulations and ethics followed at An-Najah National University and in compliance with the Declaration of Helsinki. The study received ethical approval from the Institutional Review Board (IRB) of An-Najah National University (Protocol # April-04-2018). Each participant provided written informed consent before taking part in the study.
: Not applicable.
: The authors declare that they have no competing interests.