<|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: data are available upon request due to ethical and funding constraints. ethical approval for the bellville south study from the involved institution preclude further utilization of data or specimens collected from participants for purposes other than those clearly specified on the informed consent form signed by study participants. the consent of the bellville south study participants made no reference to data sharing, deposition or use out of the control of the principal investigators. andre pascal kengne (andre.kengne@mrc.ac.za) may be contacted to request the data.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>