Early first-trimester ultrasound provides a window through which the chorionicity of twins can be diagnosed in an in vitro fertilization (IVF) population
Copperman AB, Kaltenbacher L, Walker B, Sandler B, Bustillo M, Grunfeld L.
Early first-trimester ultrasound provides a window through which the chorionicity of twins can be diagnosed in an in vitro fertilization (IVF) population.
J Assist Reprod Genet 1995; 12:693-7.