Study selection
We included randomised control trials focussed on management of HDP
where one treatment arm comprised of CCBs, and the study demographics
explicitly stated involvement of Black pregnant women. Studies were
included in our review if they met the following criteria: (1) study
involved treatment of HDP; (2) study was of a randomised control trial
design; (3) one of the treatment arms involved CCBs and (4) English
full-text. Studies were excluded if relevant outcome data were not
reported or there was no mention of ethnicity or race demographics
within the study. We also excluded case-control studies, case reports,
reviews, letters to editors, and animal/in vitro studies. Corresponding
authors were contacted individually to obtain the full text article or
where additional information was required if inclusion criteria were met
based on the information provided in the abstract. All study abstracts
were independently screened by two authors (J.J. and G.C.) with
disagreements reviewed and settled by discussion. Following abstract
screening, potentially eligible studies underwent full-text review by
the same authors.