[1] Norwegian Univ Sci & Technol, Dept Psychol, N-7491 Trondheim, Norway
[2] Uppsala Univ, Dept Surg Sci, S-75185 Uppsala, Sweden
[3] Univ Oulu, Fac Humanities, Res Unit Logoped, Oulu 90014, Finland
[4] Univ Oulu, Fac Humanities, Child Language Res Ctr, Oulu 90014, Finland
[5] Oulu Univ Hosp, Dept Otorhinolaryngol Head & Neck Surg, Oulu 90220, Finland
[6] Univ Oulu, Med Res Ctr Oulu, Oulu 90014, Finland
[7] Audiol Res Ctr, Fac Med & Hlth, S-70182 Orebro, Sweden
[8] Fac Med & Hlth, Sch Med Sci, S-70182 Orebro, Sweden
[9] Uppsala Univ, Dept Publ Hlth & Caring Sci, S-75122 Uppsala, Sweden
[10] Karolinska Inst, Dept Clin Sci Intervent & Technol, S-17177 Stockholm, Sweden