1. From Beth Israel Deaconess Medical Center, Boston, Massachusetts; University of Virginia School of Medicine, Charlottesville, Virginia; University of Tennessee College of Medicine, Chattanooga, Tennessee; University of California at San Francisco, San Francisco, California; Duke University Medical Center, Durham, North Carolina; MetroHealth Medical Center, Cleveland, Ohio; University of California at Los Angeles Medical Center, Los Angeles, California; Marshfield Clinic, Marshfield, Wisconsin;
2. and Allegheny General Hospital, Pittsburgh, Pennsylvania.