<|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: due to ethical restrictions, data collected by the authors are available upon request. requests for this data may be sent to the corresponding author: cindy firnhaber at cindy.firnhaber@righttocare.org. data were also obtained from the national health laboratory services, and the south african department of health. requests for the data from the national health laboratory service may be sent to dr babatyi malope-kgokong (babatyi.kgokong@nhls.ac.za). requests for the data from the south african department of health may be done at the following site: http://nhrd.hst.org.za/home/index.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>