Alignment Between Heart Rate Variability From Fitness Trackers and Perceived Stress: Perspectives From a Large-Scale In Situ Longitudinal Study of Information Workers - Gonzalo J Martinez; Ted Grover; Stephen M Mattingly; Gloria Mark; Sidney D’Mello; Talayeh Aledavood; Fatema Akbar; Pablo Robles-Granda; Aaron Striegel (JMIR Human Factors, 2022)