?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Hallal&rft.aufirst=PC&rft.au=Hallal%2C+PC&rft.date=29+April+2006&rft.issn=1756-1833&rft.issue=7548&rft.pages=1002-1005&rft.atitle=Early+determinants+of+physical+activity+in+adolescence%3A+prospective+birth+cohort+study&rft.volume=332&rft.title=BMJ-BRITISH+MEDICAL+JOURNAL&rft.genre=article