Erik J. Nelson

Randomised comparison of routine versus highly selective use of Doppler ultrasound in low risk pregnancies

R. Lilford, G. Mason, J. Porter, 1993, British journal of obstetrics and gynaecology.

Randomized comparison of routine vs highly selective use of Doppler ultrasound and biophysical scoring to investigate high risk pregnancies

R. Lilford, H. Macdonald, S. Tyrrell, 1990, British journal of obstetrics and gynaecology.