6Bates CJ. Vitamin A [J]. Lancet, 1995, 34(8941):31-35.
7Colizzi V, Malkovsky M. Augmentation of IL-2 production and delayed hypersensitivity in mice infected with mycobacterium bovis and fed a diet supplemented with vitamin A acetate [J]. Infect Immunol, 1985, 48:581-584.
8Buyukgebiz B, Ozalp I, Oran O, et al. Investigation of serum vitamin A levels of children who had a history of recurrent diarrhea and acute respiratory infections in Anhara [J]. J Trop Paediatr, 1990, 36(5):251-255.
9Pinnock CB, Douglas RM, Badcock NR, et al. Vitamin A status in children who are prone to respiratory tract infections [J]. Aust Paediatr J, 1986, 22(2):95-99.
10Pinnock CB, Douglas RM, Badcock NR. Vitamin A status in children who are prone to respiratory tract infections[J]. Aust Paediatr J, 1986, 22(2):95-99.
