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Knuth, J., Kunze, D. E., Benz, C., Bulian, D. R., Heiss, M. M., Lefering, R., Saad, S., Saers, T. and Krakamp, B. (2013). Is the Transnasal Access for Esophagogastroduodenoscopy in Routine Use Equal to the Transoral Route? A Prospective, Randomized Trial. Z. Gastroent., 51 (12). S. 1369 - 1377. STUTTGART: GEORG THIEME VERLAG KG. ISSN 1439-7803
Lindlohr, Cornelia, Lefering, R., Saad, S., Heiss, M. M. and Pape-Koehler, C. (2017). Training or non-surgical factors-what determines a good surgical performance? A randomised controlled trial. Langenbecks Arch. Surg., 402 (4). S. 645 - 654. NEW YORK: SPRINGER. ISSN 1435-2451