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Mechanism of heart rate variability and  research advance in its relevance to cardiovascular diseases
LI Jingxiu1, ZHANG Fujun2, LIU Xian3, LI Xueqi3
JOURNAL OF PRACTICAL ELECTROCARDIOLOGY . 2021, (4): 293 -296 .  DOI: 10.13308/j.issn.2095-9354.2021.04.014