Table 2.

Data collection information for each centre: Data acquisition system and patient consenting information.

centres	System info.	Ethical approval	Patient consenting type
Ambroise Paré Hospital, Paris, France	Olympus Exera 195	N° IDRCB: 2019-A01602-55	Endospectral study
Istituto Oncologico Veneto, Padova, Italy	Olympus endoscope H190	NA	Generic patients consent
Centro Riferimento Oncologico, IRCCS, Italy	Olympus VG-165, CV180, H185	NA	Generic patients consent
Oslo University Hospital, Oslo, Norway	Olympus Evis Exera III, CF 190	Exempted†	Written informed consent
John Radcliffe Hospital, Oxford, UK	GIF-H260Z, EVIS Lucera CV260, Olympus Medical Systems	REC Ref: 16/YH/0247	Universal consent
University of Alexandria, Alexandria, Egypt	Olympus Exera 160AL, 180AL	NA	Written informed consent

^†Approved by the data inspectorate. No further ethical approval was required as it did not interfere with patient treatment.