Evaluation of cost-utility in middle ear implantation in the ’Nordic School’: a multicenter study in Sweden and Norway - Edfeldt, N; Stromback, K; Grendin, J; bunne, M; Harder, H; Peebo, M; Eeg-Olofsson, M; Petersson, C M; Konradsson, K (Acta Otolaryngol, 2014)