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	1.	An evaluation of the validity of the pre-operative oxygen uptake efficiency slope as an indicator of cardiorespiratory fitness in elderly patients scheduled for major colorectal surgery. [electronic resource] by Bongers, B C Berkel, A E Klaase, J M van Meeteren, N L Producer: 20190225 In: Anaesthesia vol. 72 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Hepatocellular carcinoma after danazol treatment for hereditary angio-oedema. [electronic resource] by Berkel, A E M Bouman, D E Schaafsma, M R Verhoef, C Klaase, J M Producer: 20160525 In: The Netherlands journal of medicine vol. 72 Availability: No items available. Save to lists Add to cart (remove)
	3.	Brain abscess after transanal hemorrhoidal dearterialization: a case report. [electronic resource] by Berkel, A E M Witte, M E Koop, R Hendrix, M G R Klaase, J M Producer: 20130607 In: Case reports in gastroenterology vol. 7 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	4.	Isosorbide dinitrate ointment vs botulinum toxin A (Dysport) as the primary treatment for chronic anal fissure: a randomized multicentre study. [electronic resource] by Berkel, A E M Rosman, C Koop, R van Duijvendijk, P van der Palen, J Klaase, J M Producer: 20150529 In: Colorectal disease : the official journal of the Association of Coloproctology of Great Britain and Ireland vol. 16 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)