1. Conservatism in obstetrics;Cragin;N. Y. Med. J,1916
2. Cesarean sections in US PAS hospitals;Lowe;PAS Rep,1976
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4. Rupture of the uterus;O'Driscoll,1966
5. Therapeutic decision making: A cost benefit analysis;Pauker;N. Engl. J. Med,1975