Evidence to Underpin Vitamin A Requirements and Upper Limits in Children Aged 0 to 48 Months: A Scoping Review by Lee Hooper, Chizoba Esio-Bassey, Julii Brainard, Judith Fynn, Amy Jennings, Natalia Jones, Bhavesh V. Tailor, Asmaa Abdelhamid, Calvin Coe, Latife Esgunoglu, Ciara Fallon, Ernestina Gyamfi, Claire Hill, Stephanie Howard Wilsher, Nithin Narayanan, Titilopemi Oladosu, Ellice Parkinson, Emma Prentice, Meysoon Qurashi, Luke Read, Harriet Getley, Fujian Song, Ailsa A. Welch, Peter Aggett, Georg Lietz

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