Dear Dr Yasir Bin Nisar,

Your study is very interesting and give us more information on effect of IFA on early mortality of children. I have a question to ask you that in your paper you mentioned "We considered a multi-stage backward elimination modelling technique for the assessment of potential confounding factors and the primary outcome." but it seemed not to be presented in table 3 and 4. Could you give me a statement how to use this technique to control confounding factors according to table 3? thanks

Shaonong DANG

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