4Brennan D J, Robsonms, Murphym, et al. Comparative analysis of international cesarean delivery rates usinglO-group classification identifies significant variation in spontaneous labor[ J]. Am JOb stet Gyn eco, 1,2009 ;201 : 308. e 1-8.
5Eggesb M, Botten G, Stigum H, et al. Is delivery by cesarean section a risk factor for food allergy[ J ]. J Allergy Clin Immunol, 2012 ; 112 ( 3 ) :420-426.
6Yan-ying fan, Bin-yan yang, Chang-you Wu. Phenotypic and functional heterogeneity of natural killer ceils from umbilical cord blood mononuclear cells [ J ]. Immunologi- callnvestigations ,2013 ;37( 1 ) :79-96.
7江淑芳,史春梦.脐带血免疫学特性的研究进展[J].免疫学杂志,2012;37(1):79—96.
8Chen C J, Tsai CC, Hsieh JF, et al. A screening platform for compounds with potential immuno-regulatory activities using human cord blood mononuclear cells [ J ]. Comb Chem High Throughput Screen,2011 ;10(5) :777-784.
9Celia M, Fuchs A, Vermi W, et al. A human natural killer cell subset provides an innate source of IL-22for mucos- alimmunity [ J ]. Nature,2009 ;45 (5) :722-725.
10Allen VM, O' connell CM, Baskett TF. Maternal morbidity associated with cesarean delivery without labor compared with induction of labor atterm [ J ]. Obstet Gynecol, 2006 ; 108(2) :286-294.