1. Professor of Anesthesiology and Obstetrics and Gynecology, University of Florida College of Medicine, Gainesville, Florida.
2. Professor of Anesthesiology and Pediatrics and Chief, Division of Epidemiology and Biostatistics, Department of Pediatrics, University of Florida College of Medicine, Gainesville. Florida.
3. Professor and Chairman of Obstetrics and Gynecology, University of Wisconsin College of Medicine, Madison, Wisconsin.
4. Director, Wisconsin Survey Research Laboratory, Madison, Wisconsin.
5. Professor of Obstetrics and Gynecology, Michigan State University, College of Medicine, East Lansing, Michigan.