<|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 data are bound by ethical and legal restrictions. to access the data of the south africa's prevention of mother to child transmission effective study, investigators that are not part of the study team should submit a concept proposal to thu-ha dinh, md, ms (us centers for disease control and prevention (cdc), principal investigator) and ameena goga, md, ms (south africa medical research council (mrc), principal investigator) for an approval. investigators with an approved concept proposal must apply for guest researcher status in order to obtain access to a cdc or mrc workstation/data, to complete data security and confidentiality training, and to sign data use and nondisclosure agreements.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>