Heather, Nick, Emeritus Professor of Alcohol & Other Drug Studies, Division of Psychology, Northumbria University, Newcastle upon Tyne, UK. Enviar correspondencia a: Nick Heather PhD, Division of Psychology, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK. Phone: (0)191 227 4521; Fax: (0) 191 227 3190;, Reino Unido