Authors: Joann G Elmore; Raymond L Barnhill; David E Elder; Gary M Longton; Margaret S Pepe; Lisa M Reisch; Patricia A Carney; Linda J Titus; Heidi D Nelson; Tracy Onega; Anna N A Tosteson; Martin A Weinstock; Stevan R Knezevich; Michael W Piepkorn Journal: BMJ Date: 2017-06-28