Effectiveness and feasibility of a standardized stepwise drug treatment algorithm for inpatients with depressive disorders - results of a two-year observational study - Adli,M.; Berghöfer,A.; Linden,M.; Helmchen,H.; Müller-Oerlinghausen,B.; Mackert,A.; Stamm T; Bauer,M. (J Clin Psychiatr, 2002)