Similarity Check is a multi-publisher initiative to screen published and submitted content for originality.  PTL publisher uses the iThenticate software to detect instances of overlapping and similar text in submitted manuscripts. Wherever you see the “CrossRef Similarity Check” or “iThenticate” logos, you can be reassured that the publisher whose content you are reading is committed to actively combating plagiarism and publishing original research.  To find out more about Similarity Check visit http://www.crossref.org/similaritycheck.html