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Course of the subsolid nodules (SSNs). (a) Decreased in diameter ≥3 mm; (b) increased in diameter ≥3 mm or solid component(s) developed. IA, invasive adenocarcinoma; MIA, minimally invasive adenocarcinoma; T0, baseline scan; T1, first-year incidence scan; T2, second-year incidence scan.
