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. 2021 Sep 29;14:1173–1183. doi: 10.2147/JAA.S321212

Figure 2.

Figure 2

Selection of eligible patients. aLung disease due to external agents, other than smoking, such as occupational agents; active chronic obstructive pulmonary disease; bronchiolitis obliterans; pulmonary fibrosis; pulmonary hypertension; cystic fibrosis.

Abbreviations: OPCRD, Optimum Patient Care Research Database; QOF, Quality and Outcomes Framework.