Vitamin D deficiency in pregnancy and the risk of preterm birth: a nested case-control study by Tashnia Tahsin, Rasheda Khanam, Nabidul Haque Chowdhury, A. S. M. Tarik Hasan, Md. Biplob Hosen, Sayedur Rahman, Anjan Kumar Roy, Salahuddin Ahmed, Rubhana Raqib, Abdullah H. Baqui

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