1. Division of Epidemiology and Community HealthUniversity of Minnesota Minneapolis Minnesota USA
2. Department of PediatricsUniversity of Oklahoma Health Sciences Center Oklahoma City Oklahoma USA
3. HealthPartners Institute Minneapolis Minnesota USA
4. Division of Environmental Health SciencesUniversity of Minnesota Minneapolis Minnesota USA
5. Department of Food Science and NutritionUniversity of Minnesota Minneapolis Minnesota USA
6. Division of BiostatisticsUniversity of Minnesota Minneapolis Minnesota USA