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Cohen TJ, Goldner BG, Maccaro PC, Ardito AP, Trazzera S, Cohen MB, Dibs SR
A comparison of active compression- decompression cardiopulmonary resuscitation with standard cardiopulmonary resuscitation for cardiac arrests occurring in the hospital.
N Engl J Med. 1993 Dec 23;329(26):1918-1921
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Argentine Episiotomy Trial Collaborative Group
Routine vs selective episiotomy: a randomised controlled trial
Lancet. 1993 Dec 18-25;342(8886-8887):1517-8