sponsorship: The author received support for his scientific projects by DFG-grant TH624/6-1 and Alzheimer Forschung Initiative grants #10810, 13803. (DFG|TH624/6-1, Alzheimer Forschung Initiative grants|10810, Alzheimer Forschung Initiative grants|13803)
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Dietmar Rudolf Thal (2015) studied this question.
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