Publication Accuracy of the Patient Health Questionnaire-9 for screening to detect major depression: updated systematic review and individual participant data meta-analysis Negeri ZF, Levis B, Sun Y, et al. BMJ. BMJ. 2021; Download PDF
Publication The PRECIS-2 tool: designing trials that are fit for purpose Loudon K, Treweek S, Sullivan F, et al. BMJ. BMJ. 2015; Download PDF