1. Department of Infectious Diseases, Infection Control, and Employee Health, University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
2. Department of Clinical Microbiology and Infectious Diseases, Hospital General Universitario Gregorio Marañón, Instituto de Investigación Sanitaria Gregorio Marañón, Madrid, Spain
3. First Department of Critical Care Medicine, Medical School of National and Kapodistrian University of Athens, Evangelismos Hospital, Athens, Greece
4. Department of Internal Medicine, Jeju National University School of Medicine, Jeju, Republic of Korea
5. Department of Pulmonary Medicine, University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA
6. Department of Microbiology, University of Texas M. D. Anderson Cancer Center, Houston, Texas, USA