fix UMLS's SAB: 'MTHHH' -> 'HCPCS' [https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/notes.html]
fix UMLS's SAB: 'MTHHH' -> 'HCPCS' [https://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/notes.html]

OHDSI/Vocabulary-v5.0