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. 2023 Aug 14;15(8):4530–4543. doi: 10.21037/jtd-23-325

Figure 4.

Figure 4

Example of diverse sleep-onset definitions across representative studies (40,45,49,50,51,83,91,108,111,112). KC, K-complex; NREM, non-rapid eye movement sleep; SO, sleep onset; VSW, vertex sharp wave.