Reconceptualising treatment-resistant depression as difficult-to-treat depression

R. Hamish McAllister‐Williams, Celso Arango, Pierre Blier, Koen Demyttenaere, Peter Falkai, Philip Gorwood, Malcolm Hopwood, Afzal Javed, Siegfried Kasper, Gurjhinder S Malhi, Jair C. Soares, Eduard Vieta, Allan H. Young, Ανδρέας Παπαδόπουλος, A. John Rush