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Dear visitor,
the following article was originally intended for quite a different context and would have been available for us only by chance. I am grateful and happy therefore to the author, Dirk Biddle, for allowing me to make it accessible for visitors of this website as well. I think we all are greatly indebted to Dirk for the enourmous amount of labour that has gone into this article. I am sure that quite a number of patients will benefit from reading it. So once again: many, many thanks to Dirk Biddle.
June 2006, Birgit Wiedenmann-Naujoks