1. Toward improving the outcome of pregnancy: recommendations for the regional development of maternal and perinatal health services;Committee on Perinatal Health,1976
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4. Perinatal regionalization versus hospital competition: the Hartford example;Richardson;Pediatrics,1995
5. Recent changes in delivery site of low-birth-weight infants in Washington: impact on birth weight-specific mortality;Powell;Am J Obstet Gynecol,1995