Reference:
Richards DA, Hughes-Morley A, Hayes RA, Araya R, Barkham M, Bland JM, Bower P, Cape J, Chew-Graham CA, Gask L, Gilbody S, Green C, Kessler D, Lewis G, Lovell K, Manning C, Pilling S. Collaborative Depression Trial (CADET): multi-centre randomised controlled trial of collaborative care for depression – study protocol. BMC Health Services Research 2009;9: 188.