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1 There are some significant disagreement with the grading of the level of evidence and the class of recommendation for fondaparinux between the 2007 AHA/ACC and the 2007 ESC guidelines for the acute use of anticoagulants in patients with non-ST-elevation acute coronary syndromes. why difference in appearance? 在2007年AHA/ACC和2007年ESC有关非ST段抬高型急性冠脉综合征(NSTE-ACS)在患者急性期应用抗凝药的指南上，对磺达肝癸钠的证据水平等级以及推荐级别存在明显差异，为何会产生该差异？