1. Department of Clinical Dental Sciences, College of Dentistry, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi Arabia
2. School of Dentistry, Health and Care Professions, University of Portsmouth, Portsmouth PO1 2QG, UK
3. Centre for Oral Clinical and Translational Sciences, King’s College London, London SE1 9RT, UK
4. Upper GI Physiology Service, Guy’s and St. Thomas’ Hospitals NHS Foundation Trust, London SE1 9RT, UK
5. Department of Preventive and Restorative Dentistry, University of the Pacific, San Francisco, CA 94103, USA