Fry, Ethan, Karam Ayoub, Vincent L Sorrell, Joseph Souza, Aaron Hesselson, Steve Leung, and Kristin Ellison. “Echocardiographic Evaluation of His Bundle Pacing in Patients With Prolonged PR Intervals”. Cardiology and Cardiovascular Medicine 7, no. 2 (March 16, 2023): 69–78. Accessed June 21, 2026. https://fortunejournals.org/ojs/index.php/ccm/article/view/16394.