E.M. Lundequam

Relative prolongation of the terminal part of the QT segment is associated with sudden death in the elderly

N. Sotoodehnia, DW Lee, P. Stein, 2009, 2009 36th Annual Computers in Cardiology Conference (CinC).

Cyclic variation in heart rate during sleep in four recordings of up to 13 years in elderly adults

P. Stein, S. Redline, R. Cohen, 2007, 2007 Computers in Cardiology.