- Open Access
Erratum to: 'Chinese medicine combined with calcipotriol betamethasone and calcipotriol ointment for Psoriasis vulgaris (CMCBCOP): study protocol for a randomized controlled trial'
© Wen et al. 2016
- Received: 12 July 2016
- Accepted: 12 July 2016
- Published: 26 July 2016
The original article was published in Trials 2014 15:2172
Unfortunately, the original version of this article  contained an error. The superiority margin difference should be 5 % instead of 10 %. We performed a superiority test of two independent proportions with superiority margin difference of 5 % by PASS 11.0 software again, and the results were the same as mentioned in the paper before. The sentence in the "Sample size calculation" part (Page 5) is corrected as follows:
According to the supposition and as calculated by PASS 11.0 software (NCSS, LLC, Kaysville, Utah, USA), sample size of 239 in each group can achieve 90 % power and to rule out a two-sided type I error of 5 % to detect a superiority margin difference of 5 % in this two-arm trial with equal allocation in each group.
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.
- Wen Z-H, Xuan M-L, Yan Y-H, Li X-Y, Yao D-N, Li G, Guo X-F, Ou A-H, Lu C-J. Chinese medicine combined with calcipotriol betamethasone and calcipotriol ointment for Psoriasis vulgaris (CMCBCOP): study protocol for a randomized controlled trial. Trials. 2014;15:294.View ArticlePubMedPubMed CentralGoogle Scholar