adds the following dataframe to trial_data: ecu_who_scale_per_visit_data
adds the following columns to scv: ecu_who_scale_max, ecu_who_scale_max.factor, ecu_who_scale_with_diag_max, ecu_who_scale_with_diag_max.factor
primary_coding_suep_who_scale(trial_data, pid, visitid)