By James T. Cassidy, Dr. Ross E. Petty, MD, PhD, FRCPC, Ross E. Petty (Department of Paediatrics, Faculty of Medicine, University of British Columbia, Vancouver, Canada)
By Barton L. Cobert (Senior Director, Medical and Safety Services, Schering-Plough Research Institute), Pierre Biron (Professor of Pharmacology, Faculty of Medicine, Universite de Montreal)