Allowing Physicians to Choose the Value of Compensation for Participation in a Web-Based Survey: Randomized Controlled Trial

Alison E Turnbull   ^{1, 2, 3} , MPH,DVM,PhD ;   Cristi L O'Connor   ² , MHS ;   Bryan Lau   ² , ScM, MHS,PhD ;   Scott D Halpern   ^{4, 5} , MD,PhD ;   Dale M Needham   ^{1, 3, 6} , MD, PhD,FCPA

¹ School of Medicine, Division of Pulmonary and Critical Care Medicine, Johns Hopkins University, Baltimore, MD, United States

² Bloomberg School of Public Health, Department of Epidemiology, Johns Hopkins University, Baltimore, MD, United States

³ Outcomes After Critical Illness and Surgery Group, Johns Hopkins University, Baltimore, MD, United States

⁴ Perelman School of Medicine, Division of Pulmonary, Allergy and Critical Care, University of Pennsylvania, Philadelphia, PA, United States

⁵ Perelman School of Medicine, Department of Biostatistics and Epidemiology, University of Pennsylvania, Philadelphia, PA, United States

⁶ School of Medicine, Department of Physical Medicine and Rehabilitation, Johns Hopkins University, Baltimore, MD, United States