Peter Bower professor of health services research, Evangelos Kontopantelis research fellow, Alex Sutton professor of medical statistics, Tony Kendrick professor of primary care and dean, David A Richards professor of mental health services research, Simon Gilbody professor of psychological medicine & health services research et al
Bower P, Kontopantelis E, Sutton A, Kendrick T, Richards D A, Gilbody S et al.
Influence of initial severity of depression on effectiveness of low intensity interventions: meta-analysis of individual patient data
BMJ 2013; 346 :f540
doi:10.1136/bmj.f540