Cochrane library reviews
  1. african-american* or caucasian* or black* or white* or african-caribbean* or afro-caribbean* or (east NEAR/1 asian*) or (south NEAR/1 asian*) or asian* or mixed race or BAME or latin*
  2. pre?eclampsi* or (gestational NEAR/1 hypertension) or (hypertensive disease NEAR/11 pregnan*) or (hypertensi* NEAR/4 pregnan*)
  3. 1 and 2