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The toll-free 00800 VisionWorks number can be used for calls from Germany and from many other countries. If you are unable to reach VisionWorks, ask your telephone company which international area code you should use instead of the initial 00. For example 000800 VisionWorks from Brazil; 011800 VisionWorks from the United States; 001800 VisionWorks from Hong Kong, etc.
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Product News. J Fail. Anal. and Preven. 10, 90–93 (2010). https://doi.org/10.1007/s11668-010-9329-8
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DOI: https://doi.org/10.1007/s11668-010-9329-8