In search of mixed anxiety–depressive disorder: a primary care study<FNR></FNR> This article is a US Government and, as such, is in the public domain of the United States of America. . - Means-Christensen, Adrienne J.; Shernourne, Cathy D.; Roy-Byrne, Peter P.; Schulman, Martin C.; Wu, Jennifer; Dugdale, David C.; Lessler, Daniel; Stein, Murray B. (Depression & Anxiety (1091-4269), 2006)