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(A) Pearson correlation coefficients (r) of the breathing periodicity index with BPI-5, BPI-4, and BPI-3 (BPI-5, 4, 3 corresponds to the sum of the largest five, four, three Fourier coefficients). (B) Pearson correlation coefficient of MASD with MAS, MASD, and MASV, which are normalized to the largest value among all patients.
