==== Front Trials Trials Trials 1745-6215 BioMed Central London 4936 10.1186/s13063-020-04936-5 Correction Correction to: One Plus One Equals Two—will that do? A trial protocol for a Swedish multicentre randomised controlled trial to evaluate a clinical practice to reduce severe perineal trauma Edqvist M. malin.edqvist@med.lu.se 12 Dahlen H. G. 3 Häggsgård C. 1 Tern H. 1 Ängeby K. 45 Tegerstedt G. 6 Teleman P. 7 Ajne G. 6 Rubertsson C. 1 1 grid.4514.40000 0001 0930 2361Department of Health Sciences, Faculty of Medicine, Lund University, Lund, Sweden 2 grid.4714.60000 0004 1937 0626Clinical Epidemiology Unit, Department of Medicine, Karolinska, Institutet, Stockholm, Sweden 3 grid.1029.a0000 0000 9939 5719School of Nursing and Midwifery, Western Sydney University, Sydney, Australia 4 Centre for Clinical Research and Education, Region Värmland, Karlstad, Sweden 5 grid.411953.b0000 0001 0304 6002School of Education, Health and Social Studies, Dalarna University, Karlstad, Sweden 6 grid.4714.60000 0004 1937 0626Department of Obstetrics and Gynaecology, CLINTEC, Karolinska Institutet, Stockholm, Sweden 7 Department of Obstetrics and Gynaecology, Faculty of Medicine, Skåne University Hospital, Lund University, Lund, Sweden 2 12 2020 2 12 2020 2020 21 993© The Author(s) 2020Open AccessThis 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.issue-copyright-statement© The Author(s) 2020 ==== Body Correction to: Trials (2020) 21:945 https://doi.org/10.1186/s13063-020-04837-7 After publication of the original article [1], we were notified that a typo had been included in the title. Originally published title: “One Plus One Equals Two—will that do? A trial protocol for a Swedish multicentre randomised controlled trial to evaluate a clinical practice to reduce severe perineal trauma {1}” Correct title: “One Plus One Equals Two—will that do? A trial protocol for a Swedish multicentre randomised controlled trial to evaluate a clinical practice to reduce severe perineal trauma ". The original article has been corrected. ==== Refs Reference 1. Edqvist M One Plus One Equals Two—will that do? A trial protocol for a Swedish multicentre randomised controlled trial to evaluate a clinical practice to reduce severe perineal trauma Trials 2020 21 945 10.1186/s13063-020-04837-7 33225972