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BACKGROUND Degenerative aortic valve calcification is an important factor in aortic stenosis and incompetence, but the pathogenesis is unclear. The purpose of the present study was to observe the expression of p50 in degenerative calcified aortic valves, which may provide a potential therapeutic target. METHODS Fifteen cases of degenerative calcified(More)
A metamodel is a description language of models. To address the problem that validation rules of the SMP2 metamodel haven't been implemented by XML Schema, a method to enhance the accuracy of the model by adding static semantics to the SMP2 metamodel is proposed. Supposing to use Java language or OCL for constraints definition and use EMF for the validation(More)
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