Limitations of Existing Research on [Your Topic]
Previous research exhibits limitations, such as restricted examination of specific demographics (e.g., females, minors, and juveniles), insufficient sample sizes, dependence on urban concentration, neglect of chronic exposure effects, incomplete correction of covariates, and so forth.
![Limitations of Existing Research on [Your Topic]](http://copyright.bdstatic.com/vcg/creative/350d639f5f9dea23e6b81155c90bb57e425ff287.jpg "Limitations of Existing Research on [Your Topic]")
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