Table 2.
Selected articles’ levels of evidence
| Author/year/country/ | Level of evidence (Oxford Centre for EBM 2009) |
|---|---|
| 1. Patterson and Botchway/1998/Canada [29] | 4 |
| 2. Scuffham and Steed/2002/United Kingdom [30] | 3b |
| 3. Ignatius et al./2010/Finland [31] | 3b |
| 4. Herce et al./2011/Spain [32] | 1b |
| 5. Salazar-Fernandez et al./2012/Spain [33] | 1b |
| 6. Birur et al./2015/India [34] | 1b |
| 7. Marino et al./2016/Australia [35] | 2b |
| 8. Wood et al./2016 (I)/USA [36] | 4 |
| 9. Wood et al./2016 (II)/USA [37] | 2b |
| 10. Petruzzi and De Benedittis./2016/Italy [38] | 4 |
| 11. Purohit BM et al./2016/India [39] | 4 |
| 12. Estai M et al./2017/Australia [40] | 3b |
| 13. Teoh J et al./2018/Australia [41] | 3b |
| 14. Tynan et al./2018 (I)/Australia [42] | 4 |
| 15. Tynan et al./2018 (II)/Australia [43] | 4 |
| 16. Vinayagamoorthy et al./2019/India [44] | 4 |
[Ref: Centre for Evidence-Based Medicine. Levels of Evidence. Oxford: Oxford Centre for Evidence-Based Medicine; 2009. https://www.cebm.ox.ac.uk/resources/levels-of-evidence/oxford-centre-for-evidence-based-medicine-levels-of-evidence-march-2009. Accessed 20 October 2020]