Delivering stepped care: an analysis of implementation in routine practice oleh Richards David A, Bower Peter, Pagel Christina, Weaver Alice, Utley Martin, Cape John, Pilling Steve, Lovell Karina, Gilbody Simon, Leibowitz Judy, Owens Lilian, Paxton Roger, Hennessy Sue, Simpson Angela, Gallivan Steve, Tomson David, Vasilakis Christos