<|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. the data used in this study are based on a combination of data with personal identification numbers from three third parties, the copenhagen school health record register, developed and hosted by the institute of preventive medicine, the central person register for denmark, and the so-called fertility database at statistics denmark. the reason why the data cannot be freely available at a public repository is because it contains family connections, which include personal identification numbers, delivered by the central person register. according to the danish law it is not permitted to have such data publicly available. data are placed on a secure data platform at statistics denmark, from which the data cannot be downloaded for analyses outside the services of statistics denmark. access to the particular subset of data, generated by the record linkage at statistics denmark, will require a project specific permission from the institute of preventive medicine, from statistics denmark, and from danish data protection agency. director of the institute of preventive medicine, professor thorkild i.a. sørensen and statistics denmark through either charlotte nielsen cln@dst.dk or ivan thaulow ith@dst.dk with reference to project number 703266.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>