1 Department of Melanoma Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA. Electronic address: jmcquade@mdanderson.org.
2 Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
3 Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
4 Department of Melanoma Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.