TY  - GEN
AU  - Coles,E C
AU  - Altman,D G
AU  - Meire,H B
AU  - Farrant,P
TI  - Ultrasound estimation of gestational age
SN  - 0007-1447
PY  - 1979///0901
KW  - Female
KW  - Gestational Age
KW  - Humans
KW  - Menstruation
KW  - Pregnancy
KW  - Time Factors
KW  - Ultrasonography
N1  - Publication Type: Letter
UR  - https://doi.org/10.1136/bmj.1.6175.1422-b
ER  -