<|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 used in this study were obtained from the swedish medical birth register and cannot be made publicly available. however, these data can be accessed upon request to the swedish national board of health and welfare, pending approval by the appropriate ethics committee. information on the birth register and persons to contact for queries regarding access are available in english from: www.socialstyrelsen.se/register/halsodataregister/medicinskafodelseregistret/inenglish.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>