http://www.thelancet.com/journals/lancet/article/PIIS0140673606690028/fulltext
The Lancet 2006; 368:119-123
Daniel Pratt MSc a, Mary Piper FRCP b, Prof Louis Appleby FRCPsych a, Roger Webb MSc a and Dr, Prof Jenny Shaw MRCPsych - [Sub Required]
