Liao, Adolfo Wenjaw, Maria de Lourdes Brizot, Helenice Júlio Kang, Renata Almeida Assunção, and Marcelo Zugaib. 2012. “Longitudinal Reference Ranges for Fetal Ultrasound Biometry in Twin Pregnancies”. Clinics 67 (5): 451-55. https://doi.org/10.6061/clinics/2012(05)08.