Having non-invasive ways of diagnosing diseases, especially hard to reach cancers, is a huge step forward in scientific research - when it happens.  Well a new study published in the Clinical Cancer Research validates a new potential screening tool of HPV induced head and neck cancers.  In this particular study, researchers from Johns Hopkins University used oral rinses and what is called "targeted DNA amplication" to identify oral HPV infections in patients that had both HPV positive...