Evaluation criteria used in research Validation study Criteria for selecting symptoms to include in VietPOS: Based on the results of the MSAS-SF questionnaire: (1) symptoms with a prevalence rate of less than 25% and causing discomfort at the level of quite a bit and very much at a rate of 5% or higher for people with HIV and 10% or higher for cancer patients are selected; (2) symptoms that can be clinically managed; (3) distinguishable from other symptoms; (4) symptoms that do not meet the above criteria but are common and cause distress at the end of life.