API:  http://id.who.int/icd/release/10/2010/H47
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    "@id": "http://id.who.int/icd/release/10/2010/H47",
    "parent": [
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    "code": "H47",
    "title": {
        "@language": "en",
        "@value": "Other disorders of optic [2nd] nerve and visual pathways"
    },
    "classKind": "category"
}