Quinlan SC, Hawes JCL, Mines D, Ahmed S, Lanes S, Mehta V, Holick CN, Santanello N, Mast TC. Performance of an administrative claims algorithm to estimate the incidence of pure red cell aplasia in chronic hepatitis C patients. Epidemiology reports. 2015;3(1). doi: 10.7243/2054-9911-3-1
Warttig SL, Forshaw MJ, South J, White AK. New, normative, English-sample data for the Short Form Perceived Stress Scale (PSS-4). J Health Psychol. 2013 Dec;18(12):1617-28. doi: 10.1177/1359105313508346