1. Department of Women's and Children's Health, Uppsala University, SE-751 85 Uppsala, Sweden, , Center for Clinical Research Dalarna, SE-791 82 Falun, Sweden and Department of Paediatrics, Falun Hospital, SE-791 82 Falun Sweden
2. Maternal and Infant Nutrition and Nurture Unit (MAINN), School of Public Health and Clinical Sciences, University of Central Lancashire, Preston, PR1 2HE, UK
3. Department of Women's and Children's Health, Uppsala University, SE-751 85 Uppsala, Sweden