Fig. 1From: Reporting of key methodological and ethical aspects of cluster trials in hemodialysis require improvement: a systematic reviewFlow diagram of study selection. **Other: One manuscript described the statistical plan for a main publication not related to cluster randomized trials, two described a program of research not related to the target population, and two were duplicate records not previously removed. Abbreviation: RCT, randomized controlled trial; CRT, cluster randomized trialBack to article page