instruction: count the number of patients who since 2103 were diagnosed with lt eff nerv inj pelv/leg.
response: SELECT COUNT(DISTINCT admissions.subject_id) FROM admissions WHERE admissions.hadm_id IN (SELECT diagnoses_icd.hadm_id FROM diagnoses_icd WHERE diagnoses_icd.icd9_code = (SELECT d_icd_diagnoses.icd9_code FROM d_icd_diagnoses WHERE d_icd_diagnoses.short_title = 'lt eff nerv inj pelv/leg') AND STRFTIME('%y', diagnoses_icd.charttime) >= '2103')