Stimulation of the Intrinsic Cardiac Autonomic Nervous System Results in a Gradient of Fibrillatory Cycle Length Shortening Across the Atria During Atrial Fibrillation in Humans - Lim,PB; Malcolme-Lawes,LC; Stuber,T; Kojodjojo,P; Wright,IJ; Francis,DP; Davies,DW; Peters,NS; Kanagaratnam,P (JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, 2011)