Cited 23 times since 2011 (1.6 per year) source: EuropePMC Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association, Volume 9, Issue 5, 4 1 2011, Pages 449-50.e1; author reply 450-1 Risk of nonmelanoma skin cancer in patients with inflammatory bowel disease who use thiopurines is not increased. van Schaik FD, van Oijen MG, Smeets HM, van der Heijden GJ, Siersema PD, Oldenburg B