[DOI] [PubMed] [Google Scholar] Matta SG, Singh J, Sharp BM
However, other than the cosmetic effect, there is no known long-term functional harm

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However, this assumption can be misleading
A good introduction to this type of essay might set the tone, introduce the topic, and give the reader a clear idea of what you are going to present in your argument
The obvious one is that if the batteries go flat, you can just change them and keep using the mod