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Aim of recommendations like this one issued by the German Diabetes Association is to provide the GP and diabetologist and his team with information he needs for his daily practice. These recommendations are updated annually. They are written by a group of experts, but they are not evidence based guidelines. This specific recommendation for diabetes diagnosis briefly describes the diabetes types and the different options for diagnosis. Also the caveats and the practical procedure are presented.
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Petersmann et al. (2018) studied this question.
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