4 The Ottawa Hospital Research Institute, Ottawa, ON, Canada.
5 Faculty of Health Sciences Brandenburg, Brandenburg Medical School (Theodor Fontane), Institute for Health Services and Health Systems Research, Rüdersdorf, Germany.
6 Center for Health Services Research, Brandenburg Medical School (Theodor Fontane), Rüdersdorf, Germany.
7 St Michael's Hospital, Unity Health Toronto, Toronto, Canada.
8 Cochrane Hypertension Review Group, University of British Columbia, Vancouver, Canada.