1. Faculty of Arts, Psychology and Theology, Logopedics, Åbo Akademi University, Turku, Finland;
2. Department of Clinical Science, Intervention and Technology, Division of Speech and Language Pathology, Karolinska Institutet, Stockholm, Sweden;
3. Department of Communicative Sciences and Disorders, Michigan State University, East Lansing, MI, USA;
4. Department of Speech and Language Pathology, Danderyd Hospital, Stockholm, Sweden