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| Digital library | IEEE | ScienceDirect | Scopus | WoS |
|---|---|---|---|---|
| Search period | Jan 2014–Dec 2020 | Jan 2014–Dec 2020 | Jan 2014–Dec 2020 | Jan 2014–Dec 2020 |
| Language | English | English | English | English |
| Run on | Full text & metadata | Title, abstract & keywords | Title, abstract & keywords | Topic |
| Date of running search query | February 2021 | February 2021 | February 2021 | February 2021 |
