Thailand 2017.

Trial name or title	Combined therapy with low dose aspirin and calcium supplements during second trimester to reduce the risk of superimposed preeclampsia in pregnant women with chronic hypertension: a randomized‐controlled trial
Methods	Randomised
Participants	Women with chronic hypertension at 13‐16 weeks' gestation
Interventions	1. 81 mg aspirin and calcium carbonate 1500 mg 2. placebo
Outcomes	Pre‐eclampsia
Starting date	July 2017
Contact information	Sukanya Chaiyarach: sukanyatanoorat@hotmail.com
Notes

IU: international units
 IUGR: intrauterine growth restriction
 MOM: multiples of the median
 NICU: neonatal intensive care unit
 PTB: preterm birth
 SGA: small‐for‐gestational age
 vs: versus