1. From the Hospital for Children and Adolescents (MK and HKÅ) and Folkhälsan Research Center (MK), University of Helsinki, and the Nutrition Unit, National Institute for Health and Welfare (SMV), Helsinki; the Department of Pediatrics, Tampere University Hospital (MK); Tampere University Hospital Research Unit (SMV); and Tampere School of Public Health, University of Tampere (SMV), Tampere, Finland