Article History
Received: 10 October 2018
Accepted: 19 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of Kansai Medical University (approval date: December 6, 2016; approval number: 1648). All study participants provided informed consent. Written informed consent was obtained from all participants.
: Written informed consent was obtained from all patients. All patients signed an agreement that allowed publication of their clinical data. The agreement was part of informed consent.
: The industrial equipment to measure gas pressure was provided by Kobata Gauge Manufacturing Company, Limited (ExternalRef removed). Hiroyuki Kaneda applied for the system of measurement of intrapleural pressure. Takahito Nakano and Tomohiro Murakawa have nothing to declare.