Clinical guide to obsessive compulsive and related disorders [electronic resource] / Jon E. Grant, JD, MD, MPH, Professor of Psychiatry and Behavioral Neuroscience, Pritzker School of Medicine, University of Chicago, Chicago, IL, Samuel R. Chamberlain, MB/BChir, PhD, MRCPsych, Clinical Lecturer, Department of Psychiatry, University of Cambridge, UK, Brian L. Odlaug, MPH, Visiting Researcher, Department of Public Health, Faculty of Health and Medical Sciences, Univesity of Copenhagen, Copenhagen, Denmark