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Authors
Halawa, Abdelhadi http://orcid.org/0000-0002-3317-2592
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Funding
Funding for this research was provided by:
the National Bureau of High-End Foreign Experts of the Chinese Ministry of Education, Beijing, China (GDW20154100215.)
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Article History
Received: 27 May 2019
Accepted: 26 September 2019
First Online: 11 November 2019
Competing interests
: The authors declare that they have no competing interests.
