*2.2. Data Download and Extraction*

In addition to titles and abstracts, metadata of each paper and reports generated by WoS database were downloaded in text format and imported in Excel for analyzing, including:


Selected papers were research articles written in English. Grey literature, conference proceedings, reviews and books/book chapters were excluded. As the search was performed in the middle of 2019, only papers published before and in the year 2018 were included in the analysis.
