TY - Chinese Journal of Child Health Care A1 - QI Shuang-hui,WEI Bing,ZHANG Chao,LI Mo,WANG Ye,WANG Xue-na T1 - Research of immune regulation effect of vitamin A on infants with recurrent respiratory tract infection Y1 - 2017-08-10 JF - Chinese Journal of Child Health Care JO - Chinese Journal of Child Health Care SP - 837 EP - 839 VL - 25 IS - 8 UR - https://manu41.magtech.com.cn/Jwk_zgetbjzz N1 - 10.11852/zgetbjzz2017-25-08-25 ER -