The role of vitamin D supplementation for primary prevention of cancer: meta-analysis of randomized controlled trials by Tarek Haykal, Varun Samji, Yazan Zayed, Inderdeep Gakhal, Harsukh Dhillon, Babikir Kheiri, Josiane Kerbage, Vijaysai Veerapaneni, Michele Obeid, Rizwan Danish, Ghassan Bachuwa

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