Table 1.
Characteristics of the included studies
| Study | Country | Setting | Study design | Period of EC diagnosis | Patient selection |
|---|---|---|---|---|---|
| 2004 Koshyama | Japan | Tenri Hospital and Himeji National Hospital | Retrospective cohort | 1989–2001 | Not specified |
| 2014 Matsuo | USA | Los Angeles County Medical Center | Retrospective cohort | 2000–2012 | Consecutive |
| 2017 Erkilinc | Turkey | University of Medical Sciences Tepecik Education and Research Hospital | Retrospective cohort | 2007–2016 | Consecutive |
| 2017 Mao | China | Central Hospital of Lishui City | Retrospective cohort | 2006–2013 | Consecutive |
| 2017 Zhang | China | Hebei general Hospital | Retrospective cohort | 2008–2014 | Consecutive |
| 2018 Boonlak | Thailandia | Srinagarind Hospital | Retrospective cohort | 2010–2016 | Consecutive |
| 2019 Zouzoulas | Greece | “Papageorgiou” Hospital, Thessaloniki | Retrospective cohort | 2012–2017 | Consecutive |
| 2020 Jonhatty | Australia | Berghofer medical research institute | Retrospective cohort | Not specified | Not specified |