<|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 confirm that, for approved reasons, some access restrictions apply to the data underlying the findings. data used in this study came from the epiporto project. the epiporto study protocol was approved by the hospital são joão ethics committee, in 1996, and it is under the responsibility of professor henrique barros, director of the institute of public health and of the department of epidemiology, university of porto medical school. in the present study the authors used individual-level information - exact address location, health-related behaviors and anthropometric measures - which cannot be disseminated due to confidentiality issues. the epiporto study protocol is in accordance with the helsinki declaration principles, which means every precaution must be taken to protect the privacy of research subjects and the confidentiality of their personal information.' nevertheless, a formal request to the person responsible for the study (professor henrique barros) can be made by anyone interested in developing scientific research based on data collected within the epiporto study. further information can be found at the institute of public health website: http://www.ispup.up.pt/index.php?cid=coortes&lang=en.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>