All our methods and procedures are based on the work and experience of our predecessors. Without their effort and publications we would have nothing to build on. Lists of relevant literature are clearly segmented by publication type – from basic research to the evaluation of clinical outcomes. Some of the texts are freely accessible from the internet, so you just need to click the PDF icon and can read or print them straight away. With others you will find a link to the Medline database. We will continue uploading the results of ongoing research, including our own studies.