Fig. 1From: Pulmonary alveolar proteinosis in Korea: analysis of prevalence and incidence via a nationwide population-based studyIdentification of pulmonary alveolar proteinosis cases from the Health Insurance Review and Assessment Service database in Korea. PAP, pulmonary alveolar proteinosis; CT, computed tomography; KCD-7, Korean Classification of Disease, seventh edition; RID, The Rare Intractable Disease; *index date: the first claim of PAPBack to article page