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CPP vs. the GC types with a symmetric (red points) and an asymmetric (green points) vocal fold motion. The CPP for the symmetric vocal fold motion almost remains at the same level for GC1 to GC3 followed by a decrease. The CPP for the asymmetric vocal fold motion decreases for an increasing glottal insufficiency. The CPP for the asymmetric motion is collectively smaller than those for the symmetric motion.
