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This study was partially supported by grants from the Ministry of Health of China (no. WSBKYJJ2002-1-004), Guangdong Provincial Department of Science & Technology (no. 2002C31209) and the Department of Health of Guangdong Province (no. 4202002).
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Xu, X., Gao, J., Ling, D. et al. Biofeedback treatment of prehypertension: analyses of efficacy, heart rate variability and EEG approximate entropy. J Hum Hypertens 21, 973–975 (2007). https://doi.org/10.1038/sj.jhh.1002237
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