<|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 used in this paper were obtained from a third party and are therefore only available on request. these data from the ïmonitoring project on chronic disease risk factorsí (morgen) may be requested by contacting jolanda boer (jolanda.boer@rivm.nl) or monique verschuren (monique.verschuren@rivm.nl).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>