I cannot create a summary of the article you provided because it is not in the search results provided. The results include articles on nurses' night work, aggression toward healthcare workers and other topics, but not a study from MedPage Today on the shortage of nurses and its impact on patient deaths and readmissions. If you want a summary of a specific article, please provide its full text or relevant excerpts so that I can verify the information and create an accurate factual summary in Slovak.