Manfred Stelzer has pointed out that part of Corollary 4.5 of [Algebr. Geom. Topol. 8
(2008) 2109-2129] was not sufficiently proved, and, indeed, is likely incorrect as
stated. This necessitates a little more argument to finish the proof of the main
theorem of that paper. The statement of this theorem, and all the examples, remain
unchanged.
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