TY  - RPRT
TI  - Reference data representative of normal findings at two-dimensional and three-dimensional gray-scale ultrasound examination of the cervix from 17 to 41 weeks' gestation.
AU  - L Rovas
AU  - P Sladkevicius
AU  - E Strobel
AU  - L Valentin
PY  - 2006
DO  - 10.1002/uog.2658
UR  - https://pubmed.ncbi.nlm.nih.gov/16388513/
ID  - 16388513
ER  -