This report is not intended to serve as a standard of medical care; standards of medical care, which are determined locally and are constantly subject to change, are established on the basis of all the several facts of the individual case.
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EXERCISE testing has long provided a means to measure cardiovascular and physical fitness and was improved by the relatively recent addition of the ECG response to exertion. The Master's two-step test was accepted 35 years ago but today has been replaced by the treadmill or the bicycle ergometer, which uses a progression of mild to strenuous exercise. Safe protocols to be used for a progressive exercise test have been established,1,2 and the testing of cardiac fitness, both in normal and healthy subjects and patients, has become routine. Only recently, however, have data become available that allow comparison of coronary arteriography with the results of exercise testing in substantial numbers of asymptomatic subjects. This has shown a disturbingly high prevalence of both false-positive and false-negative test results, so that the value of such testing has recently been challenged.3 As a consequence, the Council on Scientific Affairs has requested several expert
Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature
Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal
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