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PROPERTY, PLANT AND EQUIPMENT, NET | 12 Months Ended
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Dec. 31, 2022
PROPERTY, PLANT AND EQUIPMENT, NET |
PROPERTY, PLANT AND EQUIPMENT, NET | 9. PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at December 31,
​ | ​ | 2021 | ​ | 2022 | ​ | 2022
​ |  | RMB |  | RMB |  | US$
Buildings |  | 775,708 |  | 782,560 |  | 113,461
Medical equipment |  | 484,653 |  | 532,165 |  | 77,157
Electronic and office equipment |  | 57,215 |  | 58,038 |  | 8,415
Motor vehicles |  | 3,718 |  | 3,717 |  | 537
Leasehold improvement and building improvements |  | 78,724 |  | 75,032 |  | 10,879
Construction in progress |  | 1,986,032 |  | 2,131,991 | ​ | 309,110
Total |  | 3,386,050 |  | 3,583,503 | ​ | 519,559
Less: accumulated depreciation |  | (224,877) |  | (308,210) |  | (44,686)
Impairment charges |  | (16,148) |  | (16,148) |  | (2,341)
​ |  | 3,145,025 |  | 3,259,145 | ​ | 472,532
​ Depreciation expenses were RMB55,030, RMB64,288 and RMB88,692 (US$12,859) for the years ended December 31, 2020, 2021 and 2022, respectively. Impairment loss of nil nil, and nil were recognized for network operating segment and impairment loss of nil, nil and nil for hospital operating segment for the years ended December 31, 2020, 2021 and 2022 respectively. For the years ended December 31, 2020, 2021 and 2022, impairment of nil, RMB2,645 and nil was written off for network operating segment upon the disposal of medical equipment and construction project. Impairment of nil,nil and nil was written off for hospital operating segment. For the year ended December 31, 2022, due to a series of cooperation agreemnets have been terminated by the Group and a cooperative hospital, RMB169,289 (US$24,545) decrease in construction in progress has been recorded accordingly. The Group held equipment under operating lease contracts with customers with an original cost of RMB105,980 and RMB128,486 (US$18,629) and accumulated depreciation of RMB78,247 and RMB100,681 (US$14,597), as of December 31, 2021 and 2022, respectively. The total net book value of the Group’s property, plant and equipment pledged as collateral for other borrowings as of December 31, 2021 and 2022 was RMB361,806 and RMB412,683 (US$ 59,833) (note 18), respectively. The total net book value of the Group’s construction in progress pledged to secure bank and other borrowings as of December 31, 2021 and 2022 was RMB1,709,761 and RMB1,754,217 (US$ 254,338) (note 18), respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126982197&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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