1. Psychiatric screening in general practice: a controlled trial;Johnstone;Lancet,1976
2. A study of one hundred chronic psychiatric patients identified in general practice;Cooper;Br J Psychiatry,1965
3. The detection of psychiatric illness by questionnaire (GHQ): Maudsley monograph 21;Goldberg,1972
4. Clinical diagnosis of depression in primary care: a meta-analysis;Mitchell;Lancet,2009
5. Guided self-help in primary care mental health: meta-synthesis of qualitative studies of patient experience;Khan;Br J Psychiatry,2007