The increased risk of melanoma in Parkinson's patients has been documented in numerous scientific studies. A first comprehensive meta-analysis was published by Liu and colleagues in the journal Neurology in 2011 and found that people with Parkinson's had more than double the risk of being diagnosed with melanoma. An important study on this topic was also published in 2010 by John Bertoni and colleagues in the Archives of Neurology (later renamed JAMA Neurology). The Bertoni study used data from the North American Parkinson's and Melanoma Survey Group and found that the incidence of malignant melanoma was 2,24 times higher in the Parkinson's cohort compared to the general population.