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Br Heart J. 1991 May; 65(5): 239–244.
PMCID: PMC1024623
Twenty four hour heart rate variability: effects of posture, sleep, and time of day in healthy controls and comparison with bedside tests of autonomic function in diabetic patients.
D J Ewing, J M Neilson, C M Shapiro, J A Stewart, and W Reid
University Department of Medicine, Royal Infirmary, Edinburgh.
Articles from British Heart Journal are provided here courtesy of
BMJ Group