1 Infectious Diseases Section, Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA.
2 Institute of Laboratory Medicine, Philipps University Marburg, Marburg, Germany; Universities of Giessen and Marburg Lung Center, German Center for Lung Research, Marburg, Germany.
3 Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, TX, USA. Electronic address: rfchemaly@mdanderson.org.
4 Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.