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Letter
Authors’ response: Association between IBD and Parkinson’s disease: seek and you shall find?
  1. Marie Villumsen1,
  2. Susana Aznar2,
  3. Bente Pakkenberg2,3,
  4. Tomasz Brudek2,
  5. Tine Jess1
  1. 1 Center for Clinical Research and Prevention, Bispebjerg and Frederiksberg Hospital, Frederiksberg, Denmark
  2. 2 Research Laboratory for Stereology and Neuroscience, Bispebjerg and Frederiksberg Hospital, Copenhagen, Denmark
  3. 3 Faculty of Health, Institute of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
  1. Correspondence to Dr Marie Villumsen, Center for Clinical Research and Prevention, Bispebjerg and Frederiksberg Hospital, Frederiksberg, DK-2000, Denmark; marie.villumsen{at}regionh.dk

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Dr Weimers and colleagues have drawn attention1 to the possibility that our recently published observation of an association between IBD and Parkinson’s disease (PD) in a nationwide Danish cohort study2 may reflect surveillance bias.

In a recently published Swedish cohort study, Dr Weimers and colleagues found that adjusting for number of healthcare visits during follow-up of patients with IBD attenuated the risk of developing PD markedly.3 They also found that the risk of future PD was …

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