@inproceedings{inproceedings, title  = {{Sample size of four clusters-per-arm as a rule of thumb for pilot cluster-randomised controlled trials}},

 publisher = {{BioMed Central}},

 url = {{https://eprints.whiterose.ac.uk/id/eprint/159944 }},

 year = {{2019}},

 month = {{10}},

 author = {{Lewis J and Scharr SJ}},

 doi = {{10.1186/s13063-019-3688-6}},

 volume = {{20}},

 journal = {{Trials}},

 issue = {{Suppl_1}},

 note = {{Accessed on 2024/12/22}}}