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The flow diagram of classification. Study 1: fMRI preprocessing and fALFF analysis; Study 2: Machine learning analyses. HDWI = hemodialysis with insomnia; HDWoI = hemodialysis without insomnia; HC = healthy controls; fALFF = fractional fractional amplitude of low frequency fluctuation; CAL = calcarine; MOG = middle occipital gyrus; Bi = bilateral; R = right; LOOCV = leave-one-out cross-validation; SVM = support vector machine
