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APA Citation
Machielsen, A., Iqbal, N., Kimman, M., Sahnan, K., Adegbola, S., Kleijnen, J., Vaizey, C., Grossi, U., Tozer, P., & Breukink, S. (2020). the development of a cryptoglandular Anal Fistula Core Outcome Set (AFCOS): an international Delphi study protocol. United European Gastroenterology journal, 8(2), 220–226. http://access.bl.uk/ark:/81055/vdc_100099957938.0x000027