AUTHOR=Xu Jing , Yu Yuetian , Liu Jialin TITLE=Acute Hypoxemic Respiratory Failure in Immunocompromised Patients: Taking Aggressive Measures to Identify Etiology JOURNAL=Frontiers in Medicine VOLUME=7 YEAR=2020 URL=https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2020.00433 DOI=10.3389/fmed.2020.00433 ISSN=2296-858X