Table 1. Main characteristics of included studies.
| Author | Year of publication | Country | Study design | Multicenter/single center | Study period | Total patients | Males (%) | Age (mean) | Attempted/failed attempt EFTR |
| Al-Bawardy, et al 10 | 2017 | US | Retrospective | 1 center | Jun 2014–Oct 2015 | 9 | 7 (78) | 63 | 9/0 |
| Backes, et al 11 | 2017 | The Netherlands | Prospective | 2 centers | Oct 2015–Dec 2016 | 26 | 13 (50) | 70 | 26/0 |
| Dinelli, et al 12 | 2017 | Italy | Retrospective | 2 centers | Unknown, 18-month period | 6 | 4 (67) | 68.5 | 7/0 |
| Schmidt, et al 13 | 2017 | Germany | Prospective | Multicenter (9) | Feb 2015–Apr 2016 | 181 | 99 (55) | 65 | 181/0 |
| Valli, et al 14 | 2017 | Switzerland | Retrospective | 1 center | Jun 2012–Oct 2016 | 60 | Not reported | 68 | 60/2 |
| Kappelle, et al 3 | 2017 | The Netherlands | Prospective | 1 center | Jan 2015–Jul 2016 | 12 | 8 (67) | 52.8 | 13/2 |
| Bas van der Spek 15 | 2018 | The Netherlands | Retrospective | 1 center | July 2015–October 2017 | 48 | 30 (63) | 67 | 51/1 |
| Markus Bauder 16 | 2018 | Germany | Retrospective | 1 center | March 2014–June 2017 | 20 | 13 (65) | 68 | 20/1 |
| Schmidt, et al 17 | 2015 | Germany | Retrospective | 2 centers | Jul 2012–Jul 2014 | 25 | Not reported | 70 | 25/1 |
| Sarker, et al 18 | 2014 | US | Retrospective | 1 center | Unknown, 12-month period | 8 | 8 (67) | 61.6 | 8/0 |
| Aepli P. 19 | 2017 | Switzerland | Retrospective | Multicenter (2) | May 2015–November 2016 | 33 | 23 (74.19) | 65.9 years | 33/2 |
| G. Andrisani 20 | 2019 | Italy | Retrospective | Multicenter (12) | January 2015–March 2018 | 114 | 61 (55.4) | 68 years | 107/0 |
| Armin Kuellmer 21 | 2019 | Germany | Retrospective | Multicenter (96) | September 2015–July 2018 | 1234 | 101 (64.7) | 72 years | 156/12 |
| Maxime E. S. Bronzwaer 22 | 2018 | The Netherlands | Prospective | 1 center | November 2016–December 2017 | 8 | 1 (14.2) | 64 years | |
| Francesco Vitali 23 | 2018 | Germany | Retrospective | 1 center | June 2015–June 2017 | 13 | 7 (53.8) | 64.3 years | |
| Wenhai Wang 24 | 2019 | China | Retrospective | 1 center | December 2014–August 2016 | 11 | 2 (40) | 60.2 years | |
| Paola Soriani 25 | 2017 | Italy | Retrospective | 1 center | June 2015–February 2016 | 6 | 5 (83.3) | 63 years | |
| Susana Mão de-Ferro 26 | 2018 | Portugal | Prospective | 1 center | March 2017–February 2018 | 9 | 6 (66) | 69 years |
EFTS, endoscopic full-thickness resection