Subgroup analyses in randomized trials: risks of subgroup-specific analyses;:: power and sample size for the interaction test. Brookes, S. T., Whitely, E., Egger, M., Smith, G. D., Mulheran, P. A., & Peters, T. J. Journal of clinical epidemiology, 57(3):229–236, 2004.
bibtex   
@article{brookes_subgroup_2004,
	title = {Subgroup analyses in randomized trials: risks of subgroup-specific analyses;:: power and sample size for the interaction test},
	volume = {57},
	number = {3},
	journal = {Journal of clinical epidemiology},
	author = {Brookes, S. T. and Whitely, E. and Egger, M. and Smith, G. D. and Mulheran, P. A. and Peters, T. J.},
	year = {2004},
	pages = {229--236}
}

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