Time to reinvent the wheel.
McParland
P
P
National Maternity Hospital, Dublin.
Johnson
H
H
D036861:Delivery, Obstetric; D004867:Equipment Design; D005260:Female; D006801:Humans; D015588:Observer Variation; D009774:Obstetrics / Q000295:instrumentation*; D011247:Pregnancy; D015203:Reproducibility of Results; D013997:Time Factors