Cluster-randomized trials (CRT) are often carried out to evaluate the kind of complex interventions that are increasingly being adopted in health services research, for example (1). Complex interventions consist of several individual interventions
The required size of cluster randomized trials of non-pharmaceutical interventions in epidemic settings
Cluster Randomized Trials: Concepts - Tutorials and Fundamentals
A. Plots of individual and mean (and standard error mean) connectivity
Understanding the cluster randomised crossover design: a graphical illustration of the components of variation and a sample size tutorial, Trials
Simulation for power in designing cluster randomized trials
Cluster-crossover design: A method for limiting clusters level effect in community-intervention studies - ScienceDirect
Cluster randomised trials with a binary outcome and a small number of clusters: comparison of individual and cluster level analysis method, BMC Medical Research Methodology
Cluster Randomized Trials: Design and Analysis
Recent Developments in the Design of Cluster Randomized Trials Society of Clinical Trials & International Clinical Trials Methodology Conference May. - ppt download
The impact of varying cluster size in cross-sectional stepped-wedge cluster randomised trials, BMC Medical Research Methodology
Analysis and reporting of stratified cluster randomized trials—a systematic survey, Trials
Methods for dealing with unequal cluster sizes in cluster randomized trials: A scoping review
