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Daily changes of SGNA in response to the LL-VNS. The SGNA was significantly decreased on the D1 of LL-VNS and was further decreased on the D4 and D5 of LL-VNS. After the cessation of LL-VNS, the SGNA remained suppressed for more than 24 hrs before gradually normalizing to baseline level. * P<0.05 compared to the D5 of baseline. † P<0.05 compared to the D3 during LL-VNS.
