Data collection
Outcome data collection starts at 3 months after random assignment and every 3 months thereafter in both treatment groups. Participants in both treatment groups will be queried on the occurrence of study outcomes on the same schedule, which is every 3 months.Assessments performed at the various visits include questionnaires, physical examinations, blood and urine collection, lab measurements, etc. (Table Measurement and data collection schedule.Abbreviations: AV, annual visits; BP, blood pressure; Bs/Rz, baseline and randomization visits; ECG, electrocardiogram; QV, quarterly visits; SES, socioeconomic status.Measured at local sites.Measured at the central lab of the Coordinating Center.