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OTHER NON-CURRENT ASSETS | 12 Months Ended
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Dec. 31, 2021
OTHER NON-CURRENT ASSETS |
OTHER NON-CURRENT ASSETS | 15. OTHER NON-CURRENT ASSETS Other non-current assets consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | As at December 31,
​ |  | Notes |  | 2020 |  | 2021 |  | 2021
​ |  | ​ | ​ | RMB |  | RMB |  | US$
Deposit-long-term |  | i) | ​ | 6,036 |  | 6,232 |  | 978
Advance to hospitals-noncurrent | ​ | ii) | ​ | 1,102 | ​ | 1,104 | ​ | 173
Others |  | iii) | ​ | — |  | 13,440 |  | 2,109
​ |  | ​ | ​ | 7,138 |  | 20,776 |  | 3,260
| i) | Impairment losses of nil and RMB19 (US$3) were provided for the balances as at December 31, 2020 and 2021.
| ii) | Impairment losses of RMB 52 and nil were provided for the balances as at December 31, 2020 and 2021.
| iii) | Impairment losses of nil and RMB 361 (US$57) were provided for the balances as at December 31, 2020 and 2021.

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