Does vitamin A supplementation protect schoolchildren from acquiring soil-transmitted helminthiasis? A randomized controlled trial
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H. Al-Mekhlafi | M. T. Al-Maktari | T. Anuar | W. Abdullah | J. Surin | Abdulhamid Ahmed | A. A. Sallam | E. Al-Zabedi | N. Moktar | M. A. Mahdy