Olang Beheshteh, Abdollahi Zahra, Neshati Roshanak, Atiya Ali Mohamed, Naghavi Mohsen, and Yngve Agneta. “Vitamin A Status in Pregnant Women in Iran in 2001 and Its Relationship With Province and Gestational Age”. Food & Nutrition Research00 (September 23, 2014). Accessed April 26, 2024. https://foodandnutritionresearch.net/index.php/fnr/article/view/661.