These guidelines may have been translated, from the originals published by ISUOG, by recognized ex-perts in the field and have been independently verified by reviewers with a relevant first language. Although all rea-sonable endeavors have been made to ensure that no fundamental meaning has been changed the process of transla-tion may naturally result in small variations in words or terminology and so ISUOG makes no claim that translated guidelines can be considered to be an exact copy of the original and accepts no liability for the consequence of any variations. The CSC's guidelines are only officially approved by the ISUOG in their English published form.