Design of a randomized controlled trial to evaluate effectiveness of methotrexate versus prednisone as first-line treatment for pulmonary sarcoidosis: the PREDMETH study by Vivienne Kahlmann, Montse Janssen Bonás, Catharina C. Moor, Coline H. M. van Moorsel, Mirjam Kool, Raisa Kraaijvanger, Jan C. Grutters, Mayka Overgaauw, Marcel Veltkamp, Marlies S. Wijsenbeek, Collaborating investigators

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