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. Author manuscript; available in PMC: 2019 Jan 1.
Published in final edited form as: Ann Thorac Surg. 2017 Nov 20;105(1):279–286. doi: 10.1016/j.athoracsur.2017.08.010

Figure 1.

Figure 1

Inclusion schema and resultant pairs after propensity score matching. FEV1, forced expiratory volume in 1 second; LS, laboratory spirometry; OS, office spirometry; PFT, pulmonary function test.