Norquist JM, Girman C, Fehnel S, Demuro-Mercon C, Santanello N. Choice of recall period for patient-reported outcome (PRO) measures: criteria for consideration. Qual Life Res. 2012 Aug 1;21(6):1016-20.
Williams VSL, Baldwin DS, Hogue SL, Fehnel SE, Hollis KA, Edin HM. Estimating the prevalence and impact of antidepressant-induced sexual dysfunction in 2 European countries: a cross-sectional patient survey. J Clin Psychiatry. 2006 Feb 1;67(2):204-10.