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Erik Jaya Gunawan and Arie Utariania and Margarita M. Maramis (2021) Relationship of Depression, Anxiety, and Stress (DASS-21), Saliva Cortisol Levels, Platelet-Lymphocyte Ratio with Severity in COVID-19. International Journal of Research Publications (IJRP), 89 (1). pp. 223-236. ISSN 2708-3578