1. Advance report of final mortality statistics, 1987,1989
2. Health, United States-1989,1990
3. Advance report of final natality statistics, 1987,1989
4. Low birth weight-United States, 1975-1987;MMWR,1990
5. Very low birthweight rate: principal predictor of neonatal mortality in industrialized populations;Lee;J Pediatr,1980