%0 Journal Article %T Evaluating the Agreement of Risk Categorization for Fetal Down Syndrome Screening between Ultrasound-Based Gestational Age and Menstrual-Based Gestational Age by Maternal Serum Markers %A Pakorn Chaksuwat %A Suchaya Luewan %A Supatra Sirichotiyakul %A Theera Tongsong %J Archive of "Obstetrics and Gynecology International". %D 2018 %R 10.1155/2018/9687042 %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5863288/