Article Information
Author Information
- K. S. Joseph, MD, PhD,
- Michael S. Kramer, MD
- Dr. Joseph was with the Bureau of Reproductive and Child Health, Laboratory Centre for Disease Control, Ottawa, Ont., when this work was done; he is Associate Editor of CMAJ.
- Dr. Kramer is with the Departments of Pediatrics and of Epidemiology and Biostatistics, Faculty of Medicine, McGill University, Montreal, Que.