Adler, UC;Krüger, S;Teut, M;Lüdtke, R;Bartsch, I;Schützler, L;Melcher, F;Willich, SN;Linde, K;Witt, CM.Homeopathy for depression--DEP-HOM: study protocol for a randomized, partially double-blind, placebo controlled, four armed study..Trials.2011.12.1.43