Perimeter:Len:Pt:Head^Fetus:Qn:US.estimated from Chitty 1994
perimeter:len:pt:head^fetus:qn:us.estimated from chitty 1994
Fetal Head Circumference estimated from gestational age by method of Chitty 1994 (US)
fetal head circumference estimated from gestational age by method of chitty 1994 (us)