Gestational age:Time:Pt:^Fetus:Qn:US+Estimated from TC.Chitkara 1987
gestational age:time:pt:^fetus:qn:us+estimated from tc.chitkara 1987
Gestational age estimated from Thoracic circumference on US by Chitkara 1987 method
gestational age estimated from thoracic circumference on us by chitkara 1987 method