title: Failure to Account for Immortal Person Time Likely Accounts for the Apparent Reduction in Surgery Among Natalizumab Users.
authors.affiliation: Section of Gastroenterology, Department of Internal Medicine, School of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada.
authors.forename: Laura E
authors.initials: LE
authors.lastname: Targownik
mesh_terms: D000914:Antibodies, Viral / Q000097:blood*; D003424:Crohn Disease / Q000150:complications* / Q000188:drug therapy*; D005260:Female; D006801:Humans; D007166:Immunosuppressive Agents / Q000627:therapeutic use*; D007577:JC Virus / Q000276:immunology*; D007968:Leukoencephalopathy, Progressive Multifocal / Q000453:epidemiology*; D008297:Male; D000069442:Natalizumab / Q000627:therapeutic use*
chemical_list: D000914:Antibodies, Viral; D007166:Immunosuppressive Agents; D000069442:Natalizumab