<|begin_of_text|><|start_header_id|>system<|end_header_id|>

You are an expert at identifying data availability statements in scientific text. A data availability statement describes where research data can be found or how it can be accessed.<|eot_id|><|start_header_id|>user<|end_header_id|>

Determine if the following text contains a data availability statement. Answer with 'yes' or 'no'.

Text: The authors confirm that, for approved reasons, some access restrictions apply to the data underlying the findings. Complete data for this study cannot be posted in a supplemental file or a public repository because of legal and ethical restrictions. The Principles of Collaboration under which the CCASAnet multi-national collaboration was founded and the regulatory requirements of the different countries' IRBs require the submission and approval of a project concept sheet by the CCASAnet executive committee and the principal investigators at participating sites. All datasets provided by CCASAnet are de-identified according to HIPAA Safe Harbor guidelines. Disclosure of a person's HIV status can be highly stigmatizing, and since re-identification of de-identified datasets may be possible when they are combined with publicly available datasets (see work of Dr. Latanya Sweeney), CCASAnet promotes the signing of a Data Use Agreement before HIV clinical data can be released. To request data, readers may contact Dr. Catherine McGowan (c.mcgowan@vanderbilt.edu).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>