Systematic reviews followed by clinical trials, followed by systematic reviews

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Atallah AN, Mesquita MRS, Duarte ML, et al. Estudo prospec- tivo “cohort” de gestantes com hipertensão arterial crônica. J Bras Nefrol. 1990;12(3):113-20.

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Altman D, Carroli G, Duley L, et al. Do women with pre- eclampsia, and their babies, benefit from magnesium sulphate? The Magpie Trial: a randomised placebo-controlled trial. Lancet. 2002;359(9321):1877-90.

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Villar J, Abdel-Aleem H, Merialdi M, et al. World Health Organization randomized trial of calcium supplementation among low calcium in- take pregnant woman. Am J Obstet Gynecol. 2006;194(3):639-49.