Sprague et al. Trials    (2020) 21:821
https://doi.org/10.1186/s13063-020-04767-4




    CORRECTION                                                                                                                                      Open Access

Correction to: Cluster identification,
selection, and description in Cluster
randomized crossover trials: the PREP-IT
trials
Sheila Sprague1,2*, Taryn Scott1, Shannon Dodds1, David Pogorzelski1, Paula McKay1, Anthony D. Harris3,
Amber Wood4, Lehana Thabane2, Mohit Bhandari1,2, Samir Mehta5, Greg Gaski6, Christina Boulton7,
Francesc Marcano-Fernández8, Ernesto Guerra-Farfán9, Joan Hebden10, Lyndsay M. O’Hara3,
Gerard P. Slobogean11 and on behalf of the PREP-IT Investigators

Correction to: Trials 21, 712 (2020)
               http://orcid.org/10.1186/s13063-020-04611-9

   Following publication of the original article [1], we                               Indiana University School of Medicine, Indianapolis, IN, USA. 7Department of
                                                                                       Orthopaedics, Banner Health and the University of Arizona-Tucson, Tucson,
were notified that the PREP-IT Investigators were not                                  AZ, USA. 8Orthopedic Department, Parc Taulí Hospital Universitari, Institut
listed as contributors. They are all listed in Supplemen-                              d’Investigació i Innovació Parc Taulí I3PT, Universitat Autònoma de Barcelona,
tary file 1 linked to this erratum.                                                    Sabadell, Spain. 9Department of Orthopaedic Surgery and Traumatology,
                                                                                       University Hospital Vall d’Hebron, Barcelona, Spain. 10Department of
                                                                                       Medicine, University of Maryland School of Medicine, Baltimore, MD, USA.
Supplementary information                                                              11
                                                                                         Department of Orthopaedics, University of Maryland, R Adams Cowley
Supplementary information accompanies this paper at https://doi.org/10.                Shock Trauma Center, Baltimore, MD, USA.
1186/s13063-020-04767-4.

    Additional file 1.
                                                                                       Reference
                                                                                       1. Sprague, et al. Cluster identification, selection, and description in cluster
Author details                                                                             randomized crossover trials: the PREP-IT trials. Trials. 2020;21:712. https://doi.
1
 Department of Surgery, Division of Orthopaedic Surgery, McMaster                          org/10.1186/s13063-020-04611-9.
University, 293 Wellington Street North, Suite 110, Hamilton, ON L8L 8E7,
Canada. 2Department of Health Research Methods, Evidence, and Impact,
McMaster University, 293 Wellington St. N., Suite 110, Hamilton, ON L8L 8E7,
Canada. 3Department of Epidemiology and Public Health, University of
Maryland School of Medicine, Baltimore, MD, USA. 4Association of
periOperative Registered Nurses, Denver, CO, USA. 5Department of
Orthopaedic Surgery, University of Pennsylvania Perelman School of
Medicine, Philadelphia, PA, USA. 6Department of Orthopaedic Surgery,

The original article can be found online at https://doi.org/10.1186/s13063-
020-04611-9.
* Correspondence: sprags@mcmaster.ca
1
 Department of Surgery, Division of Orthopaedic Surgery, McMaster
University, 293 Wellington Street North, Suite 110, Hamilton, ON L8L 8E7,
Canada
2
 Department of Health Research Methods, Evidence, and Impact, McMaster
University, 293 Wellington St. N., Suite 110, Hamilton, ON L8L 8E7, Canada
Full list of author information is available at the end of the article

                                        © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License,
                                        which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give
                                        appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if
                                        changes were made. The images or other third party material in this article are included in the article's Creative Commons
                                        licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons
                                        licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain
                                        permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
                                        The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the
                                        data made available in this article, unless otherwise stated in a credit line to the data.