what is the maximum cost of a hospital bill that includes a drug called dorzolamide 2%/timolol 0.5% ophth. since 2105?
select max(t1.c1) from ( select sum(cost.cost) as c1 from cost where cost.hadm_id in ( select prescriptions.hadm_id from prescriptions where prescriptions.drug = 'dorzolamide 2%/timolol 0.5% ophth.' ) and strftime('%y',cost.chargetime) >= '2105' group by cost.hadm_id ) as t1