Circadian variations of QTc dispersion: is it a clue to morning increase of sudden cardiac death?
Batur MK, Aksöyek S, Oto A, Yildirir A, Ozer N, Atalar E, Aytemir K, Kabakci G, Ovünç K, Ozmen F, Kes S. Circadian variations of QTc dispersion: is it a clue to morning increase of sudden cardiac death? Clin Cardiol. 1999 Feb; 22(2):103-6.