1. Institute of Neuroscience and Physiology, Division of Speech and Language Pathology, University of Gothenburg, Gothenburg, and The Swedish Institute for Health Sciences (Vårdalinstitutet), Lund University, Lund, Sweden
2. Karolinska Institutet, Department of Clinical Sciences, Danderyd Hospital, National Respiratory Centre, Stockholm, Sweden;
3. Institute of Neuroscience and Physiology, Division of Speech and Language Pathology, University of Gothenburg, Gothenburg, Sweden