Andronis L, Oppong RA, Manga N, Senanayake E, Gopal S, Charman S, Giri R, Luckraz H. Is the Venner-PneuX endotracheal tube system a cost-effective option for post cardiac surgery care? Ann Thorac Surg. 2018 Sep;106(3):757-63. doi: 10.1016/j.athoracsur.2018.03.058
Parsley (Edwards) TL. Review of the phantom respondents: opinion surveys and political representation. J Off Stat. 1994;10(3):351-5.