Faiza Nadeem, Salman Pervaiz Rana, Faqir Ullah, Mohsana Urooj Rana, M. Asghar Khattak, Rizwan Zafar Ansari, Muhammad Ishtiaq, Muhammad Nasir Khabir, Said Akbar Khan, Jawad Ali. Association Between Maternal Vitamin D Levels During 3rd Trimester Prolonged Labor and Tobacco Smoking. Annals of RSCB 2021, 1342-1351.