1. World Health Organization: Children: reducing mortality. Fact sheet No.178 updated Sep. 2013, Available at http://www.who.int/mediacentre/factsheets/fs178/en/
2. Tran Q: Acute Respiratory Infection Situation in the World – Problems on Diagnosis and Treatment. 1994, Pediatric Monographs: XVIth National Congress of Pediatrics, 324-325.
3. Vietnam Ministry of Health: Guide for Treatment of Community Acquired Pneumonia in Children. Decision no. 101/QD-KCB 09/1/. 2014
4. Bradley JS, Byington CL, Shah SS: The Management of community-acquired pneumonia in infants and children older than 3 months of age: clinical practice guidelines by the pediatric infectious diseases society and the infectious diseases society of America. Clin Infect Dis. 2011, 53 (7): 25-76. 10.1093/cid/cir531.
5. Lwanga SK, Lemeshow S: Sample size determination in health studies: a practical manua. 1991, Geneva: World Health Organization, 2-4.