MethodsA Practical Guide to Selection Bias in Instrumental Variable AnalysesSwanson, Sonja A.Author Information From the Department of Epidemiology, Erasmus MC, Rotterdam, The Netherlands. Editor’s Note: A related article appears on p. 350. Supported by an NWO/ZonMW (Netherlands Organization for Scientific Research) Veni Grant (91617066). Disclosure: The author reports no conflicts of interest. Correspondence: Sonja A. Swanson, Department of Epidemiology, Erasmus MC, P.O. Box 2040, 3000 CA Rotterdam, The Netherlands. E-mail: email@example.com. Epidemiology: May 2019 - Volume 30 - Issue 3 - p 345-349 doi: 10.1097/EDE.0000000000000973 Buy Metrics Copyright © 2019 Wolters Kluwer Health, Inc. All rights reserved.