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Most of the epidemiological studies designed to determine the prevalence of Parkinson's disease (PD) in Portugal were hospital-based and the rates reported were around 1/1000. A sentinel network of general practitioners (GPs) has been in effect in the country since 1989, involving doctors with a relatively stable list of patients. This group of doctors(More)
In some cases, the estimators obtained in compound tests have better features than the traditional ones, obtained from individual tests, cf. the use of estimators based on compound tests not only allows a substantial saving of costs, but they also can (in some situations) be more accurate than the estimators based on the individual tests. Nevertheless, each(More)
Most of the epidemiological studies designed to determine the prevalence of Parkinson's disease (PD) in Portugal were hospital-based and the rates reported were around 1/1000. A sentinel network of general practitioners (GPs) has been in effect in the country since 1989, involving doctors with a relatively stable list of patients. This group of doctors(More)
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