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RELATED PARTY TRANSACTIONS - Related party transactions (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥)
RELATED PARTY TRANSACTIONS |  |  |  |  |
Loan to: | ¥ 16,800 |  | ¥ 142,895 | $ 2,436 | ¥ 0
Interest income from: | 6,946 | $ 1,007 | 3,447 | 1,009 | 127
Loan from: | 220,369 |  | 24,432 | 31,951 | 199,000
Interest expense to: | 16,790 | $ 2,434 | 13,532 | 2,434 | 41,918
Repayment to: | 82,915 |  | 80,886 | 12,022 | 272,640
Repayment from: | 0 |  | 2,430 | 0 | 1,485
JYADK |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |
Interest income from: | 0 |  | 650 | 0 | 127
Repayment from: | 0 |  | 2,430 | 0 | 1,485
Cherrylane Investment Limited |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |
Loan from: | 0 |  | 15,932 | 0 | 0
Interest expense to: | 1,334 |  | 554 | 193 | 587
Repayment to: | 0 |  | 3,824 | 0 | 0
Zhejiang Marine Leasing Ltd |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |
Loan from: | 220,369 |  | 8,500 | 31,951 | 199,000
Interest expense to: | 15,456 |  | 12,978 | 2,241 | 41,331
Repayment to: | 82,915 |  | 77,062 | 12,022 | 272,640
Guangdong Proton International Hospital Management Co., Ltd |  |  |  |  |
RELATED PARTY TRANSACTIONS |  |  |  |  |
Loan to: | 16,800 |  | 142,895 | 2,436 | 0
Interest income from: | ¥ 6,961 |  | ¥ 2,797 | $ 1,009 | ¥ 0

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- Definition The cash outflow for a loan, supported by a promissory note, granted to related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585 + Details
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