?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Poirier&rft.aufirst=MJP&rft.au=Poirier%2C+MJP&rft.date=1+February+2021&rft.volume=19&rft.issue=1&rft.atitle=Is+the+lack+of+smartphone+data+skewing+wealth+indices+in+low-income+settings%3F&rft.title=Population+Health+Metrics&rft.genre=article