Mahomed 1998.

Trial name or title	Calcium supplementation for the prevention of pregnancy‐induced hypertension and preterm labour in twin pregnancies
Methods	Randomised controlled trial
Participants	Women with twin pregnancy
Interventions	Calcium solution (1 g elemental calcium per 5 mL).
Outcomes	Pregnancy‐induced hypertension, preterm labour, perinatal mortality and short‐term morbidity, maternal morbidity
Starting date	Not stated
Contact information	Prof K Mahomed
Notes	Sample size 400 per group