1. Center of Emphasis in Cancer Research, Department of Biomedical Sciences, Texas Tech University Health Sciences Center, Paul L. Foster School of Medicine, El Paso, TX 79905, USA
2. Division of Genetic Epidemiology, University of Utah School of Medicine, Salt Lake City, UT 84112, USA
3. Cancer Biology and Genetics Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
4. Texas Tech University Health Sciences Center El Paso-Graduate School of Biomedical Sciences, El Paso, TX 79905, USA