1 Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, TX, USA. Electronic address: htorres@mdanderson.org.
2 Department of Surgical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
3 Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
4 Department of Gastroentestinal Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.