<|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 authors do not own the data for this study. requests for the data should be submitted to the china kadoorie biobank (ckb) data access committee (http://www.ckbiobank.org/site/research/data+access+policy). as stated in the policy, as data custodian, the ckb study group must maintain the integrity of the database for future use and regulate data access to comply with prior conditions agreed with the chinese government. data security is an integral part of ckb study protocols. data can be released outside the ckb research group only with appropriate security safeguards.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>