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Distribution of procedures being conducted by laboratories at the time of survey. (n = 85 because of missing data). CPET = cardiopulmonary exercise testing; Dlco = diffusing capacity of the lung for carbon monoxide; Feno = fractional exhaled nitric oxide; MDI = metered-dose inhaler; MIP/MEP = maximal inspiratory pressure/maximal expiratory pressure; Neb = nebulizer.
