摘要
1Center for Clinical Management Research, Department of Veterans Affairs, VA Ann Arbor Healthcare System, Ann Arbor, Michigan, USA 2Division of Gastroenterology, Department of Internal Medicine, University of Michigan Health System, University of Michigan, Ann Arbor, Michigan, USA 3Institute for Healthcare Policy and Innovation, Ann Arbor, Michigan, USA Correspondence: Megan A. Adams, MD, JD, MSc, Division of Gastroenterology, Department of Internal Medicine, University of Michigan Health System, University of Michigan, 2215 Fuller Road, Gastroenterology 111-D, Ann Arbor, Michigan 48105, USA. E-mail: [email protected] published online 21 November 2017 SUPPLEMENTARY MATERIAL is linked to the online version of the paper at http://www.nature.com/ajg