The Correlation Level of Stress at the Start of Pandemic Covid-19 Related to the Frequency of Relapse in Coronary Heart Disease Patients: The Correlation Level of Stress at the Start of Pandemic Covid-19. Jurnal Ilmiah Wijaya [Internet]. 2020Dec.2 [cited 2025Apr.6];11(2). Available from: https://jurnalwijaya.com/index.php/jurnal/article/view/123