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This is a theoretical mathematics preprint proving spectral convergence properties of random feature methods; it is not peer reviewed, contains no empirical validation, and raises mechanistic questions rather than answering applied or clinical ones.
A well-conducted retrospective cohort study with adequate sample size and multivariate adjustment showing safety advantages (fewer memory complaints, shorter recovery time) for bifrontal ECT in adolescents, though efficacy was equivalent and cognitive assessment was limited to subjective measures.