O'Neal WT, Qureshi WT, Blaha MJ, Dardari ZA, Ehrman JK, Brawner CA, Soliman EZ, Al-Mallah MH. Chronotropic Incompetence and Risk of Atrial Fibrillation: The Henry Ford ExercIse Testing (FIT) Project. JACC Clin Electrophysiol. 2016 Nov; 2(6):645-652.