This information has been collected and designed to help in clinical management, the authors do not accept any responsibility for any harm, loss or damage arising from actions or decisions based on the information contained within this website and associated publications. Ultimate responsibility for the treatment of patients and interpretation of these materials lies with the medical practitioner / user. The opinions expressed are those of the authors. The inclusion in this publication of material relating to a particular product or method does not amount to an endorsement of its value, quality, or the claims made by its manufacturer.