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. 2021 Jan 11;22:41. doi: 10.1186/s13063-020-04966-z

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Study design flow chart. CAT EORTC QLQ-C30, Computerized adaptive test European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core 30; CAT EORTC QLQ-OES18, Computerized adaptive test European Organization for Research and Treatment of Cancer Quality of Life Questionnaire for Esophageal Cancer; CCI, Comprehensive Complication Index coding complications and related interventions according to the Dindo-Clavien classification; ICU, intermediate care unit; POD, postoperative day; POM, postoperative month; QoR-15, Quality of Recovery 15; SF-36, Short-Form 36. Only the most defining and relevant aspects of visit and follow-up documentation are indicated. For a more extensive list, please refer to Table 1 (trial visits)