The DOPPS Annual Report is a comprehensive collection of descriptive statistics spanning more than a decade of longitudinal DOPPS data collection. Calculated for multiple, representative cross-sectional cohorts, each Annual Report portrays country-specific results and illustrates trends over several practice areas. The Annual Report also includes a summary of DOPPS study design and methods. Statistics shown in the DOPPS Annual Report can be cited as "2012 Annual Report of the Dialysis Outcomes and Practice Patterns Study: Hemodialysis Data 1997-2011. Arbor Research Collaborative for Health, Ann Arbor, MI."