Confounding Factors in a Study Investigating Mortality in Patients With Severe Hemoptysis

All authors: Department of Emergency and Critical Care Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan Supported, in part, by KAKENHI Grants from the Japan Society for the Promotion of Science (JP 20H03782 and 20K08541), the Strategic Information and Communications R&D Promotion Programme, and the Japan Agency for Medical Research and Development. The authors have disclosed that they do not have any potential conflicts of interest.