TI - A follow-up clinical trial involving preterm neonates at risk for respiratory distress syndrome (RSD), submitted to prophylactic surfactant of porcine origin comparing two different dosage regimens PY - 1999 AU - Lefort, S. AU - Diniz, E. M. A. AU - Vaz, Flávio Adolfo Costa T2 - World Congress of Perinatal Medicine PP - Buenos Aires ER -