@inbook{inbook, title  = {{Sample size: How many subjects/clusters do I need for my cluster randomised controlled trial?}},

 url = {{}},

 year = {{2014}},

 month = {{1}},

 author = {{Campbell MJ and Walters SJ}},

 isbn = {{978-1-119-99202-8}},

 pages = {{50-82}},

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