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 M. D Liying Wang took part in the 22th World Congress of Dermatology from May 24th-29th ,2011 in Seoul, Korea.

WCD is an international academic conference organized by International League of Dermatological Societies, now WCD is one of the largest scale dermatological conferences. During this conference, Dr. Liying Wang, the manager of SIGMA participated all academic activities. We have come to know that SIGMA has reached international advanced level in dermatological equipments and clinical application, after communicated with dermatologists and exhibiting company , we better understand the future clinical demand of dermatologists and the development orientation. SIGMA will pay more attention on the latest progress of photomedicine field, with the most advanced technology for domestic clinical dermatology.

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Sigma has a large number of patents and has been regarded as a "Shanghai Hi-tech Enterprise" since 2001. Our independent research and development for the SS-03 and SS-05 ultraviolet phototherapy units won us the “Shanghai A-level High-Tech Achievements Transformation Project" in 2002.
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