20211201083600.0 2234-0726 ndpp National Digital Preservation Program, China 2019/2023 2023-10-13 Preserved : 31 to 35 Preserved : 31; 32; 33; 34; 35 Preserved Springer Nature Knee Surgery & Related Research 2234-2451 Knee surgery & related research (Online) http://www.koreaknee.or.kr/journal/journal_old.html 2234-2451 Knee surgery & related research 2019/2023 2024-01-08 Preserved : 31 to 35 Preserved : 31; 32; 33; 34; 35 Preserved Springer Nature Knee Surgery & Related Research 2234-2451 scholarsportal Scholars Portal 2024-03-02 Preserved : Preserved : Preserved Knee Surgery & Related Research 2234-0726 Knee surgery & related research lockss LOCKSS Archive 2019/2019 2024-03-25 31 31 Preserved Springer Knee Surgery & Related Research 2234-2451 Korea (South) portico Portico 2021/2024 2024-03-26 Preserved : 2021: 33, 2022: 34, 2023: 35, 2024: 36 Preserved : 2021: 33(1), 2022: 34(1), 2023: 35(1), 2024: 36(1) Preserved BioMed Central Knee Surgery & Related Research 2234-2451 Knee surgery & related research (Online) 2020/2023 2023-07-25 Preserved : 32 to 35 Preserved : 32; 33; 34; 35 Preserved Springer Nature Knee Surgery & Related Research 2234-2451 clockss CLOCKSS Archive 2021/2024 2024-03-25 33 to 36 33 to 36 Preserved Springer Knee Surgery & Related Research 2234-2451 2234-2451 2234-2451 2234-2451