A-Z of patient leaflets by department Use the A-Z links here to find out more about our children's services This page lists our patient information leaflets by department. View leaflets listed by title. Every leaflet is reviewed at least every three years to make sure it is kept up to date. V Velopharyngeal dysfunction - Information for parents and carers Description This leaflet explains more about velopharyngeal dysfunction (VPD) and provides general guidance for parents/carers. 1 to 1 of 1 Give us your feedback We value your feedback. If you have any comments about our patient information, please email PatientInformationTeam@gstt.nhs.uk Any comments we receive are kept on file for us to consider when the leaflet is next reviewed.