instruction: count the number of patients who have been diagnosed with cysticercosis and have not been back to the hospital in the same month until 2103.
response: SELECT (SELECT COUNT(DISTINCT t1.subject_id) FROM (SELECT admissions.subject_id, diagnoses_icd.charttime FROM diagnoses_icd JOIN admissions ON diagnoses_icd.hadm_id = admissions.hadm_id WHERE diagnoses_icd.icd9_code = (SELECT d_icd_diagnoses.icd9_code FROM d_icd_diagnoses WHERE d_icd_diagnoses.short_title = 'cysticercosis') AND STRFTIME('%y', diagnoses_icd.charttime) <= '2103') AS t1) - (SELECT COUNT(DISTINCT t2.subject_id) FROM (SELECT admissions.subject_id, diagnoses_icd.charttime FROM diagnoses_icd JOIN admissions ON diagnoses_icd.hadm_id = admissions.hadm_id WHERE diagnoses_icd.icd9_code = (SELECT d_icd_diagnoses.icd9_code FROM d_icd_diagnoses WHERE d_icd_diagnoses.short_title = 'cysticercosis') AND STRFTIME('%y', diagnoses_icd.charttime) <= '2103') AS t2 JOIN admissions ON t2.subject_id = admissions.subject_id WHERE t2.charttime < admissions.admittime AND STRFTIME('%y', admissions.admittime) <= '2103' AND DATETIME(t2.charttime, 'start of month') = DATETIME(admissions.admittime, 'start of month'))