综述投稿，下面这个问题该选哪一个呀？
To complete your submission you must select a statement which best reflects the availability of your research data/code. please select a response
1 no data was used for the research described in the article
2 the data that has been used is confidential
3 the authors do not have permission to share data
4 data will be made available on request
5 the authors are unable or have chosen not to specify which data has been used
6 other
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