1. Texas Therapeutics Institute, Brown Foundation Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, Houston, Texas, USA
2. Gorgas Memorial Institute of Health Studies, Panama City, Panama
3. Division of Oncology, Department of Internal Medicine, The University of Texas Health Science Center at Houston, Houston, Texas, USA
4. Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas, USA
5. Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA