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The risks associated with both diagnostic and interventional cardiac catheterization have declined so markedly that older restrictions regarding the study of even higher-risk patients deserve reassessment . A fascinating world is revealed with this exhibition , where the viewer will discover not only pieces of choice from the great civilizations of the Americas ( Olmec , Maya , Aztec , Inca ) , but also works from less well-known cultures which are equally deserving of our admiration for these Pre-Columbian master artists . The impact and success of any policies , programs and projects designed to influence fertility , mortality and migration , could be readily evaluated with the help of a complete , reliable vital registration system . The risks of coronary intervention have diminished with the increased use of coronary artery stents and GP IIb / IIIa inhibitors . SGML is a user-driven standard and the industry has evolved with a strong emphasis on usability and interchange .