Launois R, Le Moine J, Uzzan B, Fiestas Navarette LI, Benamouzig R. Systematic review and bivariate/HSROC random-effect meta-analysis of immunochemical andguaiac-based fecal occult blood tests for colorectal cancer screening. Eur J Gastroenterol Hepatol. 2014 Sep;26(9):978-89. doi: 10.1097/MEG.0000000000000160
Reed (Earnshaw) SJ, Reed JH. The use of statistical quality control charts in monitoring interviewers. Proceedings of the Survey Research Methods Section, American Statistical Association. 1997 Jan;893-8.