2Jadad AR,Moore R A,Carroll D,et al.Assessing the quality of reports of randomized clinical trials:is blinding necessary[J].Control Clin Trials,1996,17(1):1-12.
3Si NV,Grytter C,Vy NN,et al.High dose vitamin A supplementation in the course of pneumonia in Vietnamese children[J].Acta Paediatr,1997,86(10):1052-1055.
4Stephensen CB,Franchi LM,Hernandez H,et al.Adverse effects of highdose vitamin A supplements in children hospitalized with pneumonia[J].Pediatrics,1998,101 (5):E3.
5Nacul LC,Kirkwood BR,Arthur P,et al.Randomised,double blind,placebo controlled clinical trial of efficacy of vitamin A treatment in non-measles childhood pneumonia[J].BMJ,1997,315(7107):505-510.
6Rodriguez A,Hamer DH,Rivera J,et al.Effects of moderate doses of vitamin A as an adjunct to the treatment of pneumonia in underweight and normal-weight children:a randomized,double-blind,placebocontrolled trial[J].Am J Clin Nutr,2005,82(5):1090-1096.
7Fawzi WW,Mbise RL,Fataki MR,et al.Vitamin A supplementation and severity of pneumonia in children admitted to the hospital in Dar es Salaam,Tanzania[J].Am J Clin Nutr,1998,68(1):187-192.
8Sommer A.Vitamin a deficiency and clinical disease:an historical overview[J].J Nutr,2008,138(10):1835-1839.
9Villamor E,Fawzi WW.Effects of vitamin a supplementation on immune responses and correlation with clinical outcomes[J].Clin Microbiol Rev,2005,18(3):446-464.