I want to know the answer to the following question:
In what year was the article describing the type of arsenic found in Napoleon's hair published?
All the background I'm provided with is that "According to a 2007 article, the type of arsenic found in Napoleon's hair shafts was mineral, the most toxic, and according to toxicologist Patrick Kintz, this supported the conclusion that he was murdered.". Is that enough to answer the question?