TY - JOUR AU - Han, Z; Mulla, S; Beyene, J; Liao, G; McDonald, S DKnowledge Synthesis G TI - Maternal underweight and the risk of preterm birth and low birth weight: a systematic review and meta-analyses JO - Int J Epidemiol VL - 40 PY - 2011 DO - 10.1093/ije/dyq195 L3 - PubMed-ID: 21097954 SP - 65 EP - 101 ER -