The results Breitner and his colleagues published in JAMA are less reliable but easier to obtain.

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Among the first to leave was Robert Breitner, who arrived in Berlin in time to see the Wall collapse.

BBC: How Hungary let East Germans go

The work Breitner and his colleagues did does provide interesting clues to how estrogen might be involved in Alzheimer's disease.

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"It shouldn't have any impact on clinical practice, because these are not the kind of definitive results that influence clinical decisions, " says John Breitner , a professor of medicine at Johns Hopkins University who was a co-author of the Alzheimer's prevention study.

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The second sentence is apparently a reference to another study, authored by researcher John Breitner and published in the Nov. 6 issue of the Journal of the American Medical Association, that indicated that estrogen replacement might help prevent Alzheimer's but also that there was a big time lag--about a decade--between taking the drugs and seeing any benefit.

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