[1] Oticon AS, Eriksholm Res Ctr, Smorum, Denmark
[2] Univ Nottingham, Sch Med, Div Mental Hlth & Clin Neurosci, Hearing Sci Scottish Sect, Nottingham NG7 2RD, England
[3] Linkoping Univ, Dept Elect Engn, Linkoping, Sweden
[4] T&W Engn AS, Lillerod, Denmark
[5] Univ Nottingham, Sch Med, Div Mental Hlth & Clin Neurosci, Hearing Sci Scottish Sect, Nottingham, England