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2. The New Zealand study of antepartum glucocorticoid treatment;Howie,1982
3. Clinical trial of antepartum betamethasone therapy for prevention of respiratory distress in pre-term infants;Howie,1977
4. Prevention of respiratory distress syndrome in premature infants by antepartum glucocorticoid treatment;Howie,1973
5. Corticosteroids prior to preterm delivery [Cochrane Review];Crowley,1998