In chronic obstructive pulmonary disease, a combination of ipratropium and albuterol is more effective than either agent alone: An 85-day multicenter trial
R. Bone, M. Boyars, S. R. Braun, A. S. Buist, S. Campbell, T. Chick, B. M. Cohen, W. Conway, D. W. Cugell, A. DeGraff, M. Friedman, R. B. George, E. Gershwin, J. A. Kram, D. C. Levin, B. Levine, T. L. Petty, S. Rennard, L. Repsher
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