instruction: what's the minimum cost of a hospital that involves a procedure called incise cerebral meninges until 2102?
response: SELECT MIN(t1.c1) FROM (SELECT SUM(cost.cost) AS c1 FROM cost WHERE cost.hadm_id IN (SELECT procedures_icd.hadm_id FROM procedures_icd WHERE procedures_icd.icd9_code = (SELECT d_icd_procedures.icd9_code FROM d_icd_procedures WHERE d_icd_procedures.short_title = 'incise cerebral meninges')) AND STRFTIME('%y', cost.chargetime) <= '2102' GROUP BY cost.hadm_id) AS t1