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Query execution dates.
| Stage | Database | Coverage | Query execution date |
| Preliminary search | PubMed | NA – 02/12/2020 | 03/12/2020 |
| Scopus | NA – 02/12/2020 | 03/12/2020 | |
| Google Scholar | NA – 14/07/2021 | 31/07/2021 | |
| First phase | PubMed | 2004 – 08/03/2021 | 08/03/2021 |
| Scopus | 2004 – 08/03/2021 | 08/03/2021 | |
| Embase | 2004 – 08/03/2021 | 08/03/2021 | |
| Second phase | Google Scholar | 2004 – 28/07/2021 | 28/07/2021 |
