Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 45 12 2016 12 27 1667 1668 Shahram SAVAD Dept. of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Sepideh HAMZEHLOU Dept. of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Jila GHAFFOURIAN ABADI Dept. of Obstetrics and Gynecology, Kamali Hospital, Alborz University of Medical Sciences, Karaj, Iran Mohammad Hossein MODARRESSI Dept. of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Shahab NOORIAN Dept. of Pediatric Endocrinology and Metabolism, Bahonar Hospital, Alborz University of Medical Sciences, Karaj, Iran 2016 12 27 2016 12 27 Dizygotic Twins Concordant for Down Syndrome: Implication for Establishing a National Birth Defect Registry in Iran https://ijph.tums.ac.ir/index.php/ijph/article/view/8646 https://ijph.tums.ac.ir/index.php/ijph/article/download/8646/5495