?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=James&rft.au=Hall%2C+James&rft.aulast=Hall&rft.issue=2&rft.issn=0261-510X&rft.date=June+2010&rft.title=British+Journal+of+Developmental+Psychology&rft.volume=28&rft.atitle=Measuring+the+combined+risk+to+young+children%E2%80%99s+cognitive+development%3A+An+alternative+to+cumulative+indices&rft.pages=219-238&rft.genre=article