- Increased sample size up to 10% - The study group will discuss the types, scope and measures of reducing possible contamination sources through discussion and literature review - Training of trial staff and health workers to emphasize the effects of contamination. How to avoid it, how to use unbiased explanations to solve the problem - Different intervention groups will be delivered in separate areas - Intervention videos are kept by designated personnel and not available through other channels - Information packs with Sunset Without AIDS materials are clearly labeled and stored separately from normal video groups’ materials - Level and extent of participants reported contamination are measured at follow-up visits - Participants will be escorted before grouping and between survey locations - Field study team members confirm that trial participants only receive the specified intervention - Participants are randomly assigned to different groups by selecting envelopes - The data analysts are blinded to the allocation - Ensure that the educational content and duration of the video downloaded from the website of the Chinese CDC is the same as that of Sunset Without AIDS - Lecture group will be conduct by an AIDS expert for the same amount of time and content as the intervention group - Intervention sessions audio recorded, and 10% reviewed centrally [23] - All trial investigators will remain blinded |