Twin Birth Study
1.  Barrett JF, Hannah ME, Hutton EK, Willan AR, Allen AC, Armson BA, Gafni A, Joseph KS, Mason D, Ohlsson A, Ross S, Sanchez JJ, Asztalos EV; the Twin Birth Study Collaborative Group. A Randomized Trial of Planned Cesarean or Vaginal Delivery for Twin Pregnancy.  N Engl J Med. 2013 Oct 3;369(14):1295-1305.  
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