| Author | Year | Country | Study design | ETV | VPS |
| Aranha | 2018 | India | RCT | 26 | 26 |
| Navaei | 2018 | Iran | RCT | 22 | 27 |
| Kulkarni | 2017 | Uganda | RCT | 51 | 49 |
| Goyal | 2014 | India | RCT | 24 | 24 |
| Pinto | 2013 | Brazil | RCT | 16 | 26 |
| Rahman | 2018 | Bangladesh | RCT | 30 | 30 |
| Uche | 2018 | Nigeria | Retrospective | 25 | 33 |
| Lim | 2018 | USA | Retrospective | 34 | 113 |
| Beuriat | 2017 | France | Retrospective | 280 | 693 |
| Laeke | 2017 | Ethiopia | Retrospective | 24 | 77 |
| Le Fournier | 2017 | France | Retrospective | 18 | 4 |
| Kulkarni | 2016 | Multicenter | Prospective | 115 | 43 |
| Beuriat | 2016 | France | Retrospective | 32 | 18 |
| Rodis | 2016 | Germany | Retrospective | 6 | 17 |
| Jernigan | 2014 | USA | Retrospective | 872 | 4544 |
| Lima | 2014 | Brazil | Prospective | 51 | 52 |
| Elgamal | 2012 | Saudi | Retrospective | 8 | 51 |
| Gonda | 2012 | USA | Prospective | 16 | 36 |
| El-Ghandour | 2010 | Egypt | Prospective | 32 | 21 |
| Appelgren | 2010 | Sweden | Retrospective | 22 | 76 |
| Ruggiero | 2004 | Italy | Prospective | 20 | 6 |
| Tuli | 1999 | Canada | Prospective | 32 | 210 |
| Kulkarni | 2010 | Canada, Israel, and the United Kingdom | Retrospective | 489 | 720 |
| Jonathan Pindrik, MD | 2020 | USA | Prospective | 71 | 910 |
| Christopher M. Bonfield | 2021 | USA | Prospective | 14 | 28 |
| Ian C. Coulter1 | 2020 | Canada | Prospective | 115 | 43 |
| Bartosz Polis | 2018 | Poland | Retrospective | 33 | 67 |
| Reynolds | 2020 | USA | Retrospective | 51 | 326 |