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. 2022 May 23;60(5):640–646. doi: 10.1016/j.resinv.2022.04.011

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© 2022 The Japanese Respiratory Society. Published by Elsevier B.V. All rights reserved.

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Fig. 1 — Changes in the number of pulmonary function tests and bronchoscopic examinations. (A) Number of pulmonary function tests. Period 1: January–June 2018, Period 2: July–December 2018, Period 3: January–June 2019, Period 4: July–December 2019, Period 5: January–June 2020, Period 6: July–December 2020, Period 7: January–June 2021 (same below). (B) Reason for the decrease in pulmonary function tests. (C) Number of bronchoscopic examinations. (D) Reason for the decrease in bronchoscopic examinations.