Widjanarko, Mas, Mutiara Nindya, Glenn Fernandez, and Axel Jovito. 2022. “Comorbidities and COVID-19 Severity in Pediatric Patients: Systematic Review and Meta-Analysis”. Paediatrica Indonesiana 62 (1), 51-60. https://doi.org/10.14238/pi62.1.2022.51-60.