Magnitude of terminological bias in international health services research: a disambiguation analysis in mental health by Gutierrez-Colosia, MR, Hinck, P, Simon, J, Konnopka, A, Fischer, C, Mayer, S, Brodszky, V, Hakkart-van Roijen, L, Evers, S, Park, A, König, HH, Hollingworth, W, Salinas-Perez, JA, Salvador-Carulla, L