Features of active pulmonary tuberculosis without abnormal chest X-ray findings

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Acknowledgments

The authors thank Mr. Hideyuki Kato, Dr. Hiroshi Kawano, Dr. Tatsuya Otsu, Dr. Masahide Hara, and Dr. Kazuya Goto (National Hospital Organization Nishi-beppu Hospital, Oita) for their advice and support.

Ethical approval

The study protocol was approved by the Institutional Ethics Committee of National Hospital Organization Nishi-Beppu Hospital, Oita, Japan (Approval Number: 1-7; Approval Date: 27 December 2019).

Disclosure statement

All of the authors have stated explicitly that there are no conflicts of interest in connection with this article.