Within the study window, entry to study was defined as the first clinic attendance, and the endpoint was death. Patients alive and resident in Jamaica at their last visit to clinic within the study window and with no clinic visit on or after January 1, 1997 were initially considered defaulted. The post-study status of defaulted patients was investigated. Tracing strategies included questioning relatives, review of hospital dockets, letters, telephone calls, and home visits by staff members or local health workers. The status of traced patients was converted to alive, dead, or migrated. Deaths were actively traced through hospital and civil death registries to obtain an exact date of death where possible. Dates of death or migration were recorded as the date of last clinic visit when unknown.