<|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 cannot be made freely available because of restrictions imposed by the ethics committee of the fondazione irccs istituto nazionale dei tumori (milan, italy), which does not allow open/public sharing of individual data. aggregated data are available to other researchers upon request. requests may be sent to dr vittorio krogh (vittorio.krogh@istitutotumori.mi.it).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>