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Lier EJ, van den Beukel BAW, Gawria L, van der Wees PJ, van den Hil L, Bouvy ND, Cheong Y, de Wilde RL; CLAS Collaboration; van Goor H, Stommel MWJ, Ten Broek RPG.Lier EJ, et al. Among authors: stommel mwj.Surg Endosc. 2021 May;35(5):2159-2168. doi: 10.1007/s00464-020-07621-5. Epub 2020 May 14.Surg Endosc. 2021.PMID: 32410083Free PMC article.