Bailey DB, Raspa M, Bishop E, Mitra D, Wheeler A, Sacco P. Health and economic consequences of Fragile X syndrome for caregivers. J Dev Behav Pediatr. 2012 Nov 1;33(9):705-12.
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.