TY  - RPRT
TI  - Predicting pregnancy failure in 'empty' gestational sacs.
AU  - D A Nyberg
AU  - R A Filly
PY  - 2003
DO  - 10.1002/uog.33
UR  - https://pubmed.ncbi.nlm.nih.gov/12528153/
ID  - 12528153
ER  -