1. Institute of Neuroscience and Physiology, Division of Speech and Language Pathology, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden.
2. Institute of Neuroscience and Physiology, Division of Speech and Language Pathology, Sahlgrenska Academy at University of Gothenburg and CLINTEC, Division of Speech and Language Pathology, Karolinska Institute and Karolinska University Hospital, Stockholm, Sweden.
3. Nordic School of Public Health, Gothenburg, Sweden.