<|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: all data are collected and owned by the norwegian national forest inventory at the norwegian institute of bioeconomy research. some data is directly available at http://www.skogoglandskap.no/temaer/statistikk_fra_landsskogstakseringen while other data has to be obtained by contacting the national forest inventory (contact person: aksel granhus; aksel.granhus@nibio.no). the use of data is restricted by the data use policies of the national forest inventory and exact locations for inventory plots are never available. the main restriction on the data availability is due to the need to maintain an unbiased monitoring system where the permanent inventory plots are treated as all other forest and do not receive any sort of differential treatment in terms of management or human impacts. the data used in this study can be obtained by entering into a data-use agreement with the national forest inventory.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>