Table 1 Collaborating institutions for DPN patient recruitment

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Eastern China

- Beijing University of Chinese Medicine Affiliated Dongzhimen Hospital

- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine

- Guangdong Provincial Hospital of Chinese Medicine

- Hainan Provincial Hospital of Traditional Chinese Medicine

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Middle China

- Anhui Provincial Hospital of Traditional Chinese Medicine

- Liuyang Hospital of Traditional Chinese Medicine

- Luoyang No. 1 Hospital of Traditional Chinese Medicine

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Western China

- Guizhou Provincial Hospital of Traditional Chinese Medicine