An Expression of Concern has been published.
Several concerns have been raised about the study conduct, integrity, and scientific validity involving an article published in JAMA by Dr Sato et al.1 After communicating these concerns to the author and evaluating his response, we have contacted administrative officials at the author’s institution and requested that they conduct an investigation to evaluate the scientific integrity of the research and the validity of the reported study results. This notice of concern is to inform readers about these possible issues related to this article. After additional information from this investigation becomes available, we will determine whether additional action is warranted.
Corresponding Author: Howard Bauchner, MD, JAMA, 330 N Wabash Ave, Chicago, IL 60611-5885 (firstname.lastname@example.org).
Bauchner H, Fontanarosa PB. Expression of Concern: Sato et al. Effect of folate and mecobalamin on hip fractures in patients with stroke: a randomized controlled trial. JAMA. 2005;293(9):1082-1088.. JAMA. 2015;313(19):1914. doi:10.1001/jama.2015.4722