Search strategy and selection criteria

We searched google scholar and the WHO Global Information Full Text (GIFT) system using the search terms “anemia”, “anemia”, and in combination with “in pregnancy”, “during pregnancy”. Other terms like “compliance”, “deficiency”, and “micronutrient” were also used. We focused on all publications, including reviews and publications in their draft forms. We also searched reports from WHO, World, and UNICEF. We reviewed reference lists of publications and reports identified by this search strategy and selected those that addressed micronutrients and their uptake during pregnancy published between 2000 and 2015 and to which we had access to the full paper either in pdf or doc formats.