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
Dalley C, Basarir H, Wright JG, Fernando M, Pearson D, Ward SE, Thokula P, Krishnankutty A, Wilson G, Dalton A, Talley P, Barnett D, Hughes D, Porter NR, Reilly JT, Snowden JA. Specialist integrated haematological malignancy diagnostic services: an Activity Based Cost (ABC) analysis of a networked laboratory service model. J Clin Pathol. 2015 Apr;68(4):292-300. doi: 10.1136/jclinpath-2014-202624
Roberts J, Price J, Nelson LM, Burchinal M, Hennon E, Barnes B. Receptive vocabulary, expressive vocabulary, and speech production of boys with fragile X syndrome in comparison to boys with Down syndrome. Am J Ment Retard. 2007 May 1;112:177-93.