Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.|Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway.