TY  - RPRT
TI  - Improved methodology for evaluating nuchal thickness in the second trimester.
AU  - Alan V Cadkin
AU  - Eugene Pergament
PY  - 2002
DO  - 10.1002/pd.389
UR  - https://pubmed.ncbi.nlm.nih.gov/12210589/
ID  - 12210589
ER  -