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Inflammatory bowel disease and Parkinson’s disease
  1. Elsebeth Lynge1,
  2. Maria Skaalum Petersen2,3,
  3. Søren Nymand Lophaven4
  1. 1 Nykøbing Falster Hospital, Centre for Epidemiological Research, University of Copenhagen, Nykøbing Falster, Denmark
  2. 2 Department of Occupational Medicine and Public Health, The Faroese Hospital System, Tórshavn, Faroe Islands
  3. 3 Faculty of Health Sciences, Centre of Health Science, University of the Faroe Islands, Torshavn, Faroe Islands
  4. 4 Statistics and Programming, Larix A/S, Herlev, Denmark
  1. Correspondence to Professor Elsebeth Lynge, Nykøbing Falster Hospital, University of Copenhagen, Copenhagen 1165, Denmark; elsebeth{at}

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We read with interest the study by Villumsen et al on the risk of Parkinson’s disease (PD) in patients with IBD.1 This study took advantage of the long series of nation-wide data from 1977 to 2014 in the Danish Population and Patient Registers. For each person ever living in Denmark during this period, the register data include dates of birth, immigration, emigration, death, diagnosis with IBD and diagnosis with PD. This allows for a cohort design with accumulation of person-years and …

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  • Contributors EL wrote the first draft and MSP and SNL edited. All authors approved the final letter.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; internally peer reviewed.

  • Patient consent for publication Not required.