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Despite the near simultaneous, worldwide availability of published research data, the need for up- to-date review publications is stronger than ever. Professionals can no longer cope, even within the limits of their own specialist field, with the tidal wave of information and recommendations available to them on the internet. Quite apart from contemporary research data, guidelines (which once were considered to retain their influence for prolonged periods) are now updated at increasingly short intervals, and there are often variations in the recommendations from different authorities.