Van Dem, Pham, 		Trung Kien, Pham, 		Thanh Trung, Nguyen, 		Thu Huong, Nguyen, 		Thanh Nam, Nguyen, 		Quang Tue, Pham, AND 		Minh Dien, Tran.
" Clinical, Paraclinical Characteristics  and Relative Risk Factors of Severe Degree in Children  with COVID-19: Systematic Review" <em>VNU Journal of Science: Medical and Pharmaceutical Sciences</em> [Online], Volume 38 Number 1 (24 March 2022)