1. Department of Pathology, Baylor College of Medicine, Houston, TX 77030, USA
2. Department of Radiology, Michael E. DeBakey VA Medical Center, Baylor College of Medicine, Houston, TX 77030, USA
3. Department of Pathology, Ben Taub General Hospital, Baylor College of Medicine, Houston, TX 77030, USA
4. Department of Pathology, Michael E. DeBakey VA Medical Center, Baylor College of Medicine, 2002 Holcombe Boulevard, Houston, TX 77030, USA