This graphical user interface (GUI) is built upon [and in to, via the function multiarm::gui()] v.0.13 of the [R<sup><i class="fa fa-external-link" style="font-size:6px"></i></sup>](https://www.r-project.org/) package [multiarm<sup><i class="fa fa-external-link" style="font-size:6px"></i></sup>](https://mjg211.github.io/multiarm/), written by [Michael Grayling (Newcastle University)<sup><i class="fa fa-external-link" style="font-size:6px"></i></sup>](https://www.newcastle-biostatistics.com/people/michael_grayling/).

The first-line response to a possible bug should be to submit it as a *New issue* [here<sup><i class="fa fa-external-link" style="font-size:6px"></i></sup>](https://github.com/mjg211/multiarm/issues).
If the issue is more complex, or a patch is not provided in reasonable time, please email michael.grayling@newcastle.ac.uk.
Similarly, please feel free to contact with suggestions for new features, or for further support with using the package or GUI.

If you use [multiarm<sup><i class="fa fa-external-link" style="font-size:6px"></i></sup>](https://mjg211.github.io/multiarm/), please cite it with:

Grayling MJ, Wason JMS (2020) A web application for the design of multi-arm clinical trials. *BMC Cancer* __20:__80. DOI: [10.1186/s12885-020-6525-0<sup><i class="fa fa-external-link" style="font-size:6px"></i></sup>](http://doi.org/10.1186/s12885-020-6525-0).
