Great find. Looks like the combo paper some here have anticipated, but based on only the P2a Alzheimer's and P2 Parkinson's Disease Dementia trials, no reference to the P2b/3 Alzheimer's trial.
I'd guess this is a peer-reviewed article and that it's based on older trials because it was probably written and submitted quite a while ago and has spent the interim "in the peer-review process."
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