Podcasts for Research Guidance Chapter 4.3 Cluster randomized trials 5 April 2023 | audio Podcasts for Research Guidance Chapter 4.3 Cluster randomized trials Chapter 4.3 explains the role that cluster randomized trials can play in health emergency and disaster risk management (Health EDRM). 4:33 WHO Team WHO Centre for Health Development (Kobe) Summary Chapter 4.3 explains the role that cluster randomized trials can play in health emergency and disaster risk management (Health EDRM).