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Ida (and other list friends), I think your suggestion to make a general and "open question" survey seems very interesting. It needs indeed more work to analyse the results, but otherwise there"ll be also a lot more possibilities. I agree that 10% is sufficient, there is always a change this number will grow as one feels more familiar with the idea. Our group has an enormous potential on PD information, it would be regrettable not to use it. Piet Van der Poorten