TY - JOUR AU - Hyppönen, E; Cavadino, A; Williams, D TI - Vitamin D and pre-eclampsia: original data, systematic review and meta-analysis JO - Ann Nutr Metab VL - 63 PY - 2013 DO - 10.1159/000358338 SP - 331 EP - 340 N1 - et al. ER -