Please analyze the following hypothesis using only reliable and peer-reviewed academic sources, such as articles published in journals indexed by Scopus, Web of Science, PubMed, or Google Scholar. Exclude news articles, blogs, or non-academic websites. The hypothesis is:
"The Impact of AI Tools on the Quality of Research Articles"
Please provide:
1. A summary of scientific findings related to this hypothesis from the last 5 years (2020 to present).
2. Direct quotes from academic papers, including publication year and author(s).
3. At least 5 credible academic sources.
4. A conclusion based on the scientific evidence provided.
Note: If possible, include DOI numbers or direct links to the articles."