Paul Barber is Senior Lecturer at the University of Chester, UK and a registered adult and mental health nurse possessing over 35 years experience. He is also co-author of "Essentials of Pharmacology for Nurses 2e" (Open University Press, 2012)Joy Parkes is Senior Lecturer at University of Chester, UK. She is also a registered adult nurse and midwife and holds a Diploma in Health and Holistic Therapies.Diane Blundell is Senior Lecturer at University of Chester, UK and a registered adult nurse.