1. Department of Medicine, University of Maryland Medical Center Midtown Campus, Baltimore, Maryland 21201, USA
2. Department of Medicine, Greater Baltimore Medical Center, Towson, Maryland 21204, USA
3. Department of Radiology, New York Presbyterian Hospital, New York 10019, USA
4. Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
5. VA Maryland Healthcare System, Baltimore, Maryland 21201, USA