1. Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
2. Department of Internal Medicine-Division of Cardiology, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
3. Department of Molecular Biology and Immunology, University North Texas Health Science Center, Fort Worth, TX 76107, USA
4. Department of Hematology and Oncology, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA