Brain structural concomitants of resting state heart rate variability in the young and old: evidence from two independent samples - Hyun Joo Yoo; Julian F. Thayer; Steven Greening; Tae-Ho Lee; Allison Ponzio; Jungwon Min; Michiko Sakaki; Lin Nga; Mara Mather; Julian Koenig (Brain Structure and Function, 2018)