Effect of dose reduction of supplemental zinc for childhood diarrhoea: study protocol for a double-masked, randomised controlled trial in India and Tanzania by Per Ashorn, Sarah S Somji, Pratibha Dhingra, Usha Dhingra, Arup Dutta, Prabhabati Devi, Jitendra Kumar, Saikat Deb, Om Prakash Semwal, Sunil Sazawal, Karim Manji, Rodrick Kisenge, Mohamed Bakari, Enju Liu, Christopher Sudfeld, Christopher P Duggan, Rajiv Bahl, Jonathon L Simon

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