The serum copper/zinc ratio in childhood and educational attainment: a population-based study

Affiliations

• ¹ Jyväskylä University School of Business and Economics, Jyväskylä, Finland.
• ² Department of Medicine, University of Turku and Division of Medicine, Turku University Hospital, Turku, Finland.
• ³ Department of Clinical Chemistry, Fimlab Laboratories and School of Medicine, University of Tampere, Tampere, Finland.
• ⁴ University of Helsinki, Hjelt Institute, Helsinki, Finland.
• ⁵ Institute of Behavioural Sciences, University of Helsinki, Helsinki, Finland.