<|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: all data are available upon request presented to the impaact scientific leadership group. investigators interested in obtaining the data need to present a study proposal that meets with the approval of the impaact scientific leadership group; data will be available upon requested provided the researchers interested have a scientifically sound research project for which they are requesting the data. impacct does not have an ethics committee for data access requests.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>