1 Department of Internal Medicine, Louisiana State University Health Sciences Center, Shreveport, Louisiana.
2 Department of Internal Medicine, Landmark Medical Center, Woonscoket, Rhode Island.
3 Division of Hematology and Oncology, University of Iowa, Iowa City, Iowa.
4 Center for Cardiovascular Diseases and Sciences, Louisiana State University Health Sciences Center, Shreveport, Louisiana. Electronic address: [email protected].