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The evolution of scientific fields analyzed by co-word analysis and presented in strategic diagrams is simulated based on the law of cumulative advantages-the probability of a new tie between two keywords depends positively on the frequencies in which both keywords have taken part already. The results we get from simulations are compared with the results of(More)
INTRODUCTION Primary angioplasty (PTCA) or intravenous thrombolysis are the recommended treatment of acute myocardial infarction. According to results of clinical investigations however primary PTCA provides a more favourable short-term as well as long-term prognosis. As this method is much more expensive we were interested in its cost-effectiveness as(More)
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