1. Speech and Language Therapy, South Tyneside and Sunderland NHS Foundation Trust Sunderland Royal Hospital Sunderland UK
2. South Tees Hospital NHS Foundation Trust James Cook University Hospital Middlesbrough UK
3. Speech and Language Therapy, Manchester Foundation Trust North Manchester General Hospital Manchester UK
4. Department of Head and Neck Surgery, Section of Speech Pathology and Audiology The University of Texas M. D. Anderson Cancer Center Houston Texas USA
5. Liverpool Head and Neck Centre Research Team Liverpool University Hospitals Liverpool UK
6. School of Health Sciences, Institute of Population Health/Liverpool Head and Neck Centre University of Liverpool Liverpool UK