<|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 at request due to restrictions related to submitted ethics protocols. requests may be sent to dr. sonia cheng (sgcheng@ualberta.ca). larger acromegaly datasets with other study variables can be obtained from the corresponding site lead: omar serri (omar.serri@umontreal.ca), constance chik (cchik@ualberta.ca), and shereen ezzat (shereen.ezzat@utoronto.ca).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>