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Withdrawal from the research was allowed at any given time before, during or after the interview. The participants were assured that withdrawals would not affect their right to access health services. To protect the anonymity of the participants and their partners, the participants were asked to provide only pseudonyms or nicknames. The research protocol and informed consent form received ethical approval from the Institutional Review Board of the National Center for AIDS\/STD Control and Prevention, China CDC.","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"722"}}