Hörnell A., Lagström H., Lande B. and Thorsdottir I. 2013. Protein intake from 0 to 18 years of age and its relation to health: a systematic literature review for the 5th Nordic Nutrition Recommendations. Food & Nutrition Research. (May 2013). DOI:https://doi.org/10.3402/fnr.v57i0.21083.