API:  http://id.who.int/icd/release/10/2010/P20-P29
{
    "@context": "http://id.who.int/icd/contexts/contextForICD10Entity.json",
    "@id": "http://id.who.int/icd/release/10/2010/P20-P29",
    "parent": [
        "http://id.who.int/icd/release/10/2010/XVI"
    ],
    "child": [
        "http://id.who.int/icd/release/10/2010/P20",
        "http://id.who.int/icd/release/10/2010/P21",
        "http://id.who.int/icd/release/10/2010/P22",
        "http://id.who.int/icd/release/10/2010/P23",
        "http://id.who.int/icd/release/10/2010/P24",
        "http://id.who.int/icd/release/10/2010/P25",
        "http://id.who.int/icd/release/10/2010/P26",
        "http://id.who.int/icd/release/10/2010/P27",
        "http://id.who.int/icd/release/10/2010/P28",
        "http://id.who.int/icd/release/10/2010/P29"
    ],
    "browserUrl": "http://apps.who.int/classifications/icd10/browse/2010/en#/P20-P29",
    "code": "P20-P29",
    "title": {
        "@language": "en",
        "@value": "Respiratory and cardiovascular disorders specific to the perinatal period"
    },
    "classKind": "block"
}