Normalise the urinary antigen data (binax results)
Source:R/mapping-uad-binax.R, R/mapping-uad-serotypes.R
      map_urine_binax.RdRESULT -> pneumo.binax_result, .x (text)
EVENT_DATE -> pneumo.test_date (date)
SUBJECT -> admin.consented_record_number (study_id)
BARCODE -> pneumo.urine_antigen_sample_id (name)
RESULT -> pneumo.binax_result, .x (text)
EVENT_DATE -> pneumo.test_date (date)
SUBJECT -> admin.consented_record_number (study_id)
BARCODE -> pneumo.urine_antigen_sample_id (name)