W Frappell Cooke, M Gulina, K Green, J Hacker Hughes and N. Greenberg
Occupational Medicine 60 ( 8 ): 645 - 650 , 2010
K Mulligan, N Jones, C Woodhead, M Davies, S Wessely and N. Greenberg
The British Journal of Psychiatry 197 ( 5 ): 405 - 410 , 2010