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Cohort formation. AZA = azathioprine; CHUM = Centre Hospitalier de l’Université de Montréal; HP = hypersensitivity pneumonitis; MMD = multidisciplinary discussion; MMF = mycophenolate mofetil; PFT = pulmonary function test; UBC = University of British Columbia; UCalgary = University of Calgary; UCSF = University of California, San Francisco.
