<|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 national cohort study was based on data from the danish medical birth register (mbr). according to danish law and data protect agency, the authors are not able to share the register data used in this study with other researchers. the register is kept by the above mentioned institutions and not by any one individual person. therefore readers may only contact the institutionsstatistics denmark, sejrøgade 11, dk-2100 copenhagen (www.dst.dk)the danish data protection agency, borgergade 28, 5, 1300 copenhagen. however, there is limited information on the register in danish can be found from the following link: http://www.ssi.dk/sundhedsdataogit/registre%20og%20kliniske%20databaser/de%20nationale%20sundhedsregistre/graviditet%20fodsler%20born/fodselsregister.aspx.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>