Secular trends in diagnostic code density in electronic healthcare data from health care systems in the Vaccine Safety Datalink project.
Hechter RC, Qian L, Sy LS, Greene SK, Weintraub ES, Naleway AL, Rowhani-Rahbar A, Donahue JG, Daley MF, Vazquez-Benitez G, Lugg MM, Jacobsen SJ. Secular trends in diagnostic code density in electronic healthcare data from health care systems in the Vaccine Safety Datalink project. Vaccine. 2013 Feb 04; 31(7):1080-5.