1Laungani SG, Delivoria B, Gintzler A, et al. Apgar scores and cerebrospin::d fluidβ- endorp- hinlike im-munor- activity during the first day of life [ J]. Am J DisChild, 1985, 139: 403.
2Wardlaw SL, Stark RI, Baxi L, et al. Plasma beta- endorphin and beta - lipotropin in tile human fetus at delivery. Correlation with arterial pH and PO2 [J]. J Clin Endocrinol Metab, 1979. 49: 888.