Study	Reason for exclusion
Bernabe 2005	Transhiatal oesophagectomy was performed for less than 90% of oesophageal cancers and separate data were not available for people with pancreatic cancers
Blazeby 2011	Not transhiatal oesophagectomy
Bresadola 2006	No separate data for transhiatal oesophagectomy
Burdall 2015	Not transhiatal oesophagectomy
Csendes 2013	Not transhiatal oesophagectomy
Cuesta 2012	Editorial
Dolan 2013	Not transhiatal oesophagectomy
Fabian 2008	No separate data for transhiatal oesophagectomy
Ferreira 2004	Review
Harrison 2013	Unclear whether transhiatal oesophagectomies were included
Kang 2013	No separate data for transhiatal oesophagectomy
Lee 2013	Cost‐effectiveness study with no primary research data
Mamidanna 2012	No separate data for transhiatal oesophagectomy
Mao 2012	No separate data for transhiatal oesophagectomy
Mariette 2012	Letter to editor
Messenger 2015	No separate data for transhiatal oesophagectomy
Parameswaran 2013	Not transhiatal oesophagectomy
Perry 2009	Transhiatal oesophagectomy was performed for less than 90% of oesophageal cancers and separate data were not available for people with pancreatic cancers
Rice 2012	Editorial
Safranek 2010	Not transhiatal oesophagectomy
Scheepers 2008	No control group
Schoppmann 2010	Not transhiatal oesophagectomy
Ujiki 2013	Comment on excluded study (Perry 2009)
Yamasaki 2011	Not transhiatal oesophagectomy