<|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 from this study cannot be made publicly available due to an ethical restriction imposed by the ghana health services ethical review committee. however, requests for data can be sent to the authors at j.l.browne@umcutrecht.nl.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>