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*{{pmid18222393}}
*<b>[http://www.kidney.de/mlpefetch.php?search=18222393 Clinical research methodology I: introduction to randomized trials ]</b> J Am Coll Surg 2008; 206(2) ; 361-9 Kao LS; Tyson JE; Blakely ML; Lally KP
*18222393*