原文見:Aghajafari F,Nagulesapillai T,Ronksley PE,et al.Association between maternal serum 25-h(huán)ydroxy-vitamin D level and pregnancy and neonatal outcomes:systematic review and Meta-analysis of observational studies[J].BMJ,2013,26:346.Published at:http://www.bmj.com/content/346/bmj.f1169