HRV SPECTRAL POWER AND MORALITY IN CHRONIC HEART FAILURE (CHF): 5 YEAR RESULTS ON THE UK HEART STUDY. - Moore, R. K. G.; Groves, D.; Kearney, M. T.; Eckberg, D. L.; Callahan, T. S.; Shell, W. E.; Fox, K. A. A.; Nolan, J. F. (Heart, 2004)