Erratum
Unfortunately, the original version of this article [1] contained an error. There were errors in the reference numbers in Additional file 1. This has now been corrected and Additional file 1 is included here with the correct reference numbers.
Additional file
Footnotes
The online version of the original article can be found under doi:10.1186/s13063-016-1155-1.
Reference
- 1.McCarthy O, French RS, Roberts I, Free C. Simple steps to develop trial follow-up procedures. Trials. 2016;17:28. doi: 10.1186/s13063-016-1155-1. [DOI] [PMC free article] [PubMed] [Google Scholar]