CYT
发表于 2025-3-28 18:31:05
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ATP861
发表于 2025-3-28 18:52:22
Use of Sentinel Systems in the Evaluation of the Impact of AIDS and HIV Infectionlity and their comparability between countries or parts of countries (Holland, 1988). Morbidity data for the general population are generally lacking while the use of morbidity data from hospitals is difficult since the corresponding population is unknown, the so-called denominator problem.