A Smartphone App (AnSim) With Various Types and Forms of Messages Using the Transtheoretical Model for Cardiac Rehabilitation in Patients With Coronary Artery Disease: Development and Usability Study

Jah Yeon Choi   ^{1 *} , MD, PhD ;   Ji Bak Kim   ^{1 *} , MD, PhD ;   Sunki Lee   ² , MD ;   Seo-Joon Lee   ³ , PhD ;   Seung Eon Shin   ¹ , BS ;   Se Hyun Park   ⁴ , PhD ;   Eun Jin Park   ¹ , MD, PhD ;   Woohyeun Kim   ¹ , MD, PhD ;   Jin Oh Na   ¹ , MD, PhD ;   Cheol Ung Choi   ¹ , MD, PhD ;   Seung-Woon Rha   ¹ , MD, PhD ;   Chang Gyu Park   ¹ , MD, PhD ;   Hong Seog Seo   ¹ , MD, PhD ;   Jeonghoon Ahn   ⁵ , PhD ;   Hyun-Ghang Jeong   ⁶ , MD, PhD ;   Eung Ju Kim   ⁴ , MD, PhD

¹ Cardiovascular Center, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Republic of Korea

² Division of Cardiology, Department of Internal Medicine, Hallym University Dongtan Sacred Heart Hospital, Dongtan, Republic of Korea

³ Department of Medical Informatics, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea

⁴ Sports Medical Center, Seoul, Republic of Korea

⁵ Department of Health Convergence, Ewha Womans University, Seoul, Republic of Korea

⁶ Department of Psychiatry, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Republic of Korea

*these authors contributed equally