Is Nephrolithiasis an Unrecognized Extra-Articular Manifestation in Ankylosing Spondylitis? A Prospective Population-Based Swedish National Cohort Study with Matched General Population Comparator Subjects

• Ane Krag Jakobsen,

  Affiliation Department of Urology, Skåne University Hospital, Malmö, Sweden

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• Lennart T. H. Jacobsson,

  Affiliations Department of Rheumatology and Inflammation Research, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden, Department of Rheumatology, Lund University, Malmö, Sweden

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• Oliver Patschan,

  Affiliation Department of Urology, Skåne University Hospital, Malmö, Sweden

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• Johan Askling,

  Affiliation Clinical Epidemiology Unit and Rheumatology Unit, Department of Medicine (Solna), Karolinska Institutet, Stockholm, Sweden

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• Lars Erik Kristensen

  * E-mail: larserik_kristensen@yahoo.com

  Affiliations Department of Rheumatology and Inflammation Research, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden, The Parker Institute and Department of Rheumatology; Frederiksberg and Bispebjerg, Denmark

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