Quantitative data are presented as proportions, median and quartiles or range (where appropriate). Proportions are presented with 95% confidence intervals (CI) based on a binomial distribution. All quantitative data were analysed using non-parametric statistics (Chi-square or Kruskal-Wallis). Differences were considered significant when p < 0.05.
All statistical calculations were performed using STATA 14.1 (StataCorp, Texas, USA).
Copyright and License information: The Author(s). ©2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.
Do you have any questions about this protocol?
Post your question to gather feedback from the community. We will also invite the authors of this
article to respond.