Marshall, Steven A.; Jones, Ronald N.; Murray, Patrick R.; Washington, John A.; Allen, Stephen D.; Gerlach, E. Hugh; Erwin, Meridith E.; Marshall Steven A.; University of Iowa College of Medicine; Jones Ronald N.; University of Iowa College of Medicine; Murray Patrick R.; Washington University Medical Center; Washington John A.; The Cleveland Clinic Foundation; Allen Stephen D.; Indiana University Medical Center; Gerlach E. Hugh; St. Francis Regional Medical Center; Erwin Meridith E.; University of Iowa College of Medicine