Please provide the actual answer to my question in the following JSON format without any introductory and concluding sentences. User is doing a medical record audit and searching for WBC in Labs clinical document type. The search term could be an abbreviation, or a full-form, or a short-hand single letter. Find all contextually relevant medical ontology concepts, relevant semantics, and relevant synonyms for the user search term in the JSON format strictly with keys: search_term and related_concept name only from UMLS