Caroline Watkins, Leanne Daniels, Cathy Jack, Hazel Dickinson, Martin van den Broek
Watkins C, Daniels L, Jack C, Dickinson H, van den Broek M.
Accuracy of a single question in screening for depression in a cohort of patients after stroke: comparative study
BMJ 2001; 323 :1159
doi:10.1136/bmj.323.7322.1159