TY  - BOOK
AU  - Callen, Peter W.
AU  - Norton, Mary E. [(Professor in maternal health)]
AU  - Scoutt, Leslie M.
AU  - Feldstein, Vickie A.
TI  - Callen's ultrasonography in obstetrics and gynecology
SN  - 9780323328340
PY  - 2017///]
CY  - Philadelphia, PA
PB  - Elsevier
KW  - Obstetrics, Medical
ER  -