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机构:
Natl Inst Hlth & Welf, Dept Children Young People & Families, Oulu 90101, Finland
Univ Oulu, Inst Hlth Sci, Oulu 90014, Finland
Univ London Imperial Coll Sci Technol & Med, Dept Epidemiol & Biostat, London SW7 2AZ, England Eunice Kennedy Shriver Natl Inst Child Hlth & Hum, Epidemiol Branch, Dept Epidemiol Stat & Prevent Res, NIH, Rockville, MD 20852 USA