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Engel J Jr, Ackermann RF, Kuhl DE, Phelps ME.Engel J Jr, et al. Among authors: ackermann rf.Res Publ Assoc Res Nerv Ment Dis. 1985;63:163-84.Res Publ Assoc Res Nerv Ment Dis. 1985.PMID: 3927456Review.No abstract available.