Systematic Reviews and Meta-and Pooled Analyses Associations of Maternal Vitamin B 12 Concentration in Pregnancy With the Risks of Preterm Birth and Low Birth Weight : A Systematic Review and Meta-Analysis of Individual Participant Data

Tormod Rogne*, Myrte J. Tielemans, Mary Foong-Fong Chong, Chittaranjan S. Yajnik, Ghattu V. Krishnaveni, Lucilla Poston, Vincent W. V. Jaddoe, Eric A. P. Steegers, Suyog Joshi, Yap-Seng Chong, Keith M. Godfrey, Fabian Yap, Raquel Yahyaoui, Tinku Thomas, Gry Hay, Marije Hogeveen, Ahmet Demir, Ponnusamy Saravanan, Eva Skovlund, Marit P. Martinussen, Geir W. Jacobsen, Oscar H. Franco, Michael B. Bracken, and Kari R. Risnes