Tobacco use, exposure to second-hand smoke among pregnant women and their association with birth weight: A retrospective cohort study by Amrutha Varshani Krishnamurthy, Palanivel Chinnakali, Gowri Dorairajan, Shanthosh Priyan Sundaram, Gokul Sarveswaran, Midhune Sivakumar, Kishore Krishnamoorthy, Hemalatha Dayalane, Vijay Sinouvassan

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