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Other long-term liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Other long-term liabilities |
Schedule of other long-term liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | As at December 31,
​ |  | Notes |  | 2019 |  | 2020 |  | 2020
​ | ​ | ​ | ​ | RMB | ​ | RMB | ​ | US$
Accrued unrecognized tax benefits & surcharge |  | i) |  | 102,740 |  | 74,728 |  | 11,452
Lease deposit received from hospital | ​ | ​ |  | 1,998 |  | 1,998 |  | 306
​ | ​ | ​ |  | 104,738 |  | 76,726 |  | 11,758
| i) | The amounts of unrecognized tax benefit are based on the recognition and measurement criteria of ASC Topic 740. The balance is presented as non-current liabilitiy in the consolidated financial statements as at December 31, 2020 due to the fact that the Group does not anticipate payments of cash within one year. The Group recorded accrued unrecognized tax benefits & surcharge amounting to RMB 102,740 and RMB 74,728 (US$11,452) (note 26) as of December 31, 2019 and 2020, respectively.

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