1. Departments of Obstetrics and Gynaecology,
2. Medical Research Council Group in Fetal and Neonatal Health and Development,
3. Lawson Research Institute, and
4. London Health Sciences Centre, University of Western Ontario, London, Ontario N6A 5A5; and
5. Biochemistry, and
6. Pediatrics,
7. Department of Physiology, University of Toronto, Toronto, Ontario, Canada M5S 1A8