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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 …
Contributors MV conducted the analyses, TJ wrote the draft, all authors contributed to and accepted the final version of the letter.
Competing interests None declared.
Patient consent Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
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