N. M. Girdler is a Professor of Sedation Dentistry at the School of Dental Sciences, Newcastle University, Newcastle upon Tyne, UK.
C. M. Hill is an Honorary Senior Lecturer at the School of Dentistry, Cardiff University, UK.
K. E. Wilson is an Associate Clinical Lecturer in Sedation Dentistry at the School of Dental Sciences, Newcastle University, Newcastle upon Tyne, UK.