Chronic obstructive pulmonary disease exacerbation frequency and serum IgG levels

Affiliations

• ¹ Department of Medicine, University of Ottawa at The Ottawa Hospital, Ottawa, Ontario, Canada; Clinical Epidemiology Program, The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada; Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada. Electronic address: jcowan@toh.ca.
• ² Department of Medicine, University of Ottawa at The Ottawa Hospital, Ottawa, Ontario, Canada; Clinical Epidemiology Program, The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.
• ³ Department of Medicine, University of Ottawa at The Ottawa Hospital, Ottawa, Ontario, Canada; Clinical Epidemiology Program, The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada; School of Epidemiology, Public Health and Preventative Medicine, University of Ottawa, Ottawa, Ontario, Canada.
• ⁴ Department of Medicine, University of Ottawa at The Ottawa Hospital, Ottawa, Ontario, Canada; Clinical Epidemiology Program, The Ottawa Hospital Research Institute, Ottawa, Ontario, Canada; Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada; School of Epidemiology, Public Health and Preventative Medicine, University of Ottawa, Ottawa, Ontario, Canada.