References
Azpurua H, Funai EF, Coraluzzi LM, Doherty LF, Sasson IE, Kliman M, Kliman HJ: Determination of placental weight using two-dimensional sonography and volumetric mathematic modeling. Am J Perinatol. 2010, 27 (2): 151-5. 10.1055/s-0029-1234034.