Funding for this research was provided by:
Islamic Development Bank (Ph.D. scholarship)
Ghent University (Special Research Fund (BOF) scholarship)
Text and Data Mining valid from 2018-01-27
Accepted: 12 January 2018
First Online: 27 January 2018
Compliance with ethical standards
: This study does not involve human participants nor vertebrate animals, so no informed consent is needed.
: The authors declare that they have no conflict of interest.