Background:CLCN1-related myotonia congenita (MC) is one of the most common forms of non-dystrophic myotonia. in which muscle relaxation is delayed after voluntary or evoked contraction. However. there is limited data of clinical and molecular spectrum of MC patients in China. https://www.lightemupsequences.com/flash-pick-Tiki-Luau-Shaped-Thank-You-Cards-Tropical-Hawaiian-Summer-Party-Thank-You-Note-Cards-with-Envelopes-Set-of-12-top-super