Raghunathan K, Layton JB, Ohnuma T, Shaw AD. Observational research using propensity scores. Adv Chronic Kidney Dis. 2016 Nov;23(6):367-72. doi: 10.1053/j.ackd.2016.11.010
Brown TM, Holland J, Bokowy KL, Horblyuk R. Can transformational programs aimed at improving hospital management, leadership, and productivity systems affect financial performance? J Hospital Admin. 2013 Jul 30;2(4):111-9.
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.