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Journal Article
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