1. Department of Medicine University of Texas Southwestern Medical Center Dallas Texas USA
2. Pharmacy Service Veterans Affairs North Texas Health Care System Dallas Texas USA
3. Department of Medicine Texas Tech University Health Sciences Center School of Medicine Lubbock Texas USA
4. Department of Surgery University of Texas Southwestern Medical Center Dallas Texas USA
5. Department of Medicine Emory University Atlanta Georgia USA
6. Department of Medicine Minneapolis Heart Institute Minneapolis Minnesota USA
7. Department of Medicine Case Western Reserve University and University Hospitals Cleveland Ohio USA