<|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: this study is based on multiple-linked data of national swedish routine registers including the total population register (tpr), national population and housing censuses, the longitudinal data base on education, income and employment (louise) and the cause of death registers. the data is maintained at the centre for health equity studies (chess) in stockholm and was approved by the regional ethical review board of karolinska institutet on 2002-11-11. chess my be contacted at: chess, centre for health equity studies, se-106 91 stockholm, phone: +46 8 16 20 00.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>