“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 11, no. 2 (December 2, 2020). Accessed July 4, 2025. https://www.jurnalwijaya.com/index.php/jurnal/article/view/123.