API:  http://id.who.int/icd/release/10/2010/N91
{
    "@context": "http://id.who.int/icd/contexts/contextForICD10Entity.json",
    "@id": "http://id.who.int/icd/release/10/2010/N91",
    "parent": [
        "http://id.who.int/icd/release/10/2010/N80-N98"
    ],
    "child": [
        "http://id.who.int/icd/release/10/2010/N91.0",
        "http://id.who.int/icd/release/10/2010/N91.1",
        "http://id.who.int/icd/release/10/2010/N91.2",
        "http://id.who.int/icd/release/10/2010/N91.3",
        "http://id.who.int/icd/release/10/2010/N91.4",
        "http://id.who.int/icd/release/10/2010/N91.5"
    ],
    "browserUrl": "http://apps.who.int/classifications/icd10/browse/2010/en#/N91",
    "code": "N91",
    "title": {
        "@language": "en",
        "@value": "Absent, scanty and rare menstruation"
    },
    "exclusion": [
        {
            "label": {
                "@language": "en",
                "@value": "ovarian dysfunction"
            }
        }
    ],
    "classKind": "category"
}