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Paper published by Dr Chris Kalberg:
Original Research
Umeclidinium/vilanterol as step-up therapy from tiotropium in patients with moderate COPD: a randomized, parallel-group, 12-week study
Kerwin EM, Kalberg CJ, Galkin DV, Zhu C, Church A, Riley JH, Fahy WA
International Journal of Chronic Obstructive Pulmonary Disease 2017, 12:745-755
Published Date: 24 February 2017