Williams LK, Pladevall-Vila M, Fendrick AM, Lafata JE, McMahon LF. Differences in the reporting of care-related patient injuries to existing reporting systems. Jt Comm J Qual Patient Saf. 2003 Sep;29(9):460-7.
Parsley (Edwards) TL. Review of the phantom respondents: opinion surveys and political representation. J Off Stat. 1994;10(3):351-5.