API:  http://id.who.int/icd/release/10/2019/M80-M85
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    "@id": "http://id.who.int/icd/release/10/2019/M80-M85",
    "parent": [
        "http://id.who.int/icd/release/10/2019/M80-M94"
    ],
    "child": [
        "http://id.who.int/icd/release/10/2019/M80",
        "http://id.who.int/icd/release/10/2019/M81",
        "http://id.who.int/icd/release/10/2019/M82",
        "http://id.who.int/icd/release/10/2019/M83",
        "http://id.who.int/icd/release/10/2019/M84",
        "http://id.who.int/icd/release/10/2019/M85"
    ],
    "browserUrl": "http://apps.who.int/classifications/icd10/browse/2019/en#/M80-M85",
    "code": "M80-M85",
    "title": {
        "@language": "en",
        "@value": "Disorders of bone density and structure"
    },
    "classKind": "block"
}