Received: 28 February 2017
Accepted: 24 January 2018
First Online: 3 April 2018
Ethics approval and consent to participate
: The scientific and ethical approval for the study was granted by the research committee of the Public Health College and King Abdullah International Medical Research Center (KAIMRC) with IRB approval # SP14/044. All the participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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