Department of Respiratory Medicine, Kumamoto Regional Medical Center, Kumamoto, Japan

All procedures involving human participants were performed in accordance with the ethical standards laid down by institutional and/or national research committees and were in compliance with the principle of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.

K.K.: conceptualization, data curation, methodology, investigation, formal analysis, visualization, writing—original draft, writing—review and editing. S.F.: investigation, visualization, writing—review and editing. S.T.: investigation, writing—review and editing. R.T.: investigation, writing—review and editing.

The authors declare no conflicts of interest.

Correspondence: Kosuke Kashiwabara, MD, Department of Respiratory Medicine, Kumamoto Regional Medical Center, 5-16-10 Honjo, Kumamoto, 860-0811, Japan. E-mail: [email protected].