1 Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA. Electronic address: aemalek@mdanderson.org.
2 Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
3 Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.