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https://scholar.google.com/scholar_lookup?title=Estimating%20the%20global%20prevalence%20of%20inadequate%20zinc%20intake%20from%20national%20food%20balance%20sheets:%20Effects%20of%20methodological%20assumptions&author=Wessells,+K.R.&author=Singh,+G.M.&author=Brown,+K.H.&publication_year=2012&journal=PLoS+One&volume=7&pages=e50565&doi=10.1371/journal.pone.0050565