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Rakesh P Patel, John D Lang, Alvin B Smith, Jack H Crawford 
World J Hepatol 6(1):1-8. Published online Jan 27, 2014. doi: 10.4254/wjh.v6.i1.1
Rolf Teschke, Albrecht Wolff, Christian Frenzel, Alexander Schwarzenboeck, Johannes Schulze, Axel Eickhoff 
World J Hepatol 6(1):17-32. Published online Jan 27, 2014. doi: 10.4254/wjh.v6.i1.17
Systematic Review
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