1. Staff physician. Department of Anesthesiology. Philadelphia General Hospital. Present address: Assistant Professor. Hahnemann Medical College and Hospital and the Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania.
2. Third year resident, Department of Anesthesiology. Temple University Health Sciences Center.
3. Professor of Anesthesiology, Temple University and University of Pennsylvania Medical Schools. Present address: Hahnemann Medical College and Hospital of Philadelphia.
4. Associate Professor of Anesthesiology, University of Pennsylvania.
5. Professor of Radiology, University of Pennsylvania. Graduate Hospital. Present address: Massachusetts Ceneral Hospital, Boston. Massachusetts.
6. Assistant Professor of Anesthesiology. Hospital of the University of Pennsylvania.