G. J. Hofmeyr,A. P. Betran,M. Singata-Madliki,G. Cormick,S. P. Munjanja,S. Fawcus,S. Mose,D. Hall,A. Ciganda,A. H. Seuc,T. A. Lawrie,E. Bergel,J. M. Roberts,P. von Dadelszen,J. M. Belizan,F. Althabe,D. Sawchuck,M. Vidler,S. Allie,J. Anthony,K. Frank,A. de Greeff,S. Fawcus,J. Hofmeyr,M. Kovane,P. Kovane,T. Lawrie,N. Mshweshwe,V. Mqikela,P. Njikelana,N. Novikova,A. Oyebajo,C. Parker,A. Phuti,E. van Papendorp,X. Williams,T. Dannemann,A. Seuc,L. Magee,F. Donnay,S. Drebit,J. Roberts,B. Guzha,E. Makaza,S. Manyame,S. Munjanja,E. Tahuringana and G. Calcium Preeclampsia Study. Prepregnancy and early pregnancy calcium supplementation among women at high risk of pre-eclampsia: a multicentre, double-blind, randomised, placebo-controlled trial. Lancet. 2019;393(10169):10.1016/s0140-6736(18)31818-x.