1. Korea Artificial Organ Center, Department of Thoracic and Cardiovascular Surgery, and Department of Biomedical Engineering, College of Medicine, Korea University, Seoul 136-705, Republic of Korea, Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, Center for Biomedical Engineering, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts 02115, and Department of Biomedical Engineering,...