Opportunities to Address Specialty Care Deserts and the Digital Divide through the Veterans Health Administration’s Telehealth Hub-and-Spoke Cardiology Clinic: Retrospective Cohort Study - Rebecca Lauren Tisdale; Colin Purmal; Neil Kalwani; Alexander Sandhu; Paul Heidenreich; Donna Zulman; Tanvir Hussain (Journal of Medical Internet Research, 2024)