title: Commentary on Hey and Kimmelman.
authors: Department of Medical Ethics and Health Policy, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA joffes@upenn.edu.
authors: Steven
authors: S
authors: Joffe
authors: Department of Biostatistics and Epidemiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
authors: Susan S
authors: SS
authors: Ellenberg
mesh_terms: D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000941:ethics*; D012107:Research Design